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keimko_
keimko_
28d agoDaily Life

Camshaft timing off by 1 tooth.

I was going in to replace the cam and crank seals, as well as the timing belt. But before starting, I tried to get to TDC and noticed that the cam sprockets seem misaligned by 1 tooth. what might be the best way to handle this? *ignore the coolant hose, I havent gotten to moving that out of the manner yet* **6g72 Montero sport v6 3L engine**

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70 Comments

SamPark
SamPark· 28d ago

Don’t worry about the marks on the belt. Get your motor to top dead center and use the actual marks on the crank pulley/cam sprocket to see if it’s accurate. This is the only way to tell if it’s actually off.

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Ontique_Gur8893
Ontique_Gur8893· 28d ago

Buddy look at the marks on the cams and crank. They have marks for Top Dead Center ( TDC). The paint marks are to help but the metal marks are gospel. If your OCD about the paint marks and it wasn't 1 tooth off, you'll be hand cranking that motor for a while before it all line...

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trueL_uck2677
trueL_uck2677· 28d ago

I don’t fully understand. I drew the marks on my belt from the marks on my cam sprocket. And the lines, to me, look off. Is this not correct?

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3qdntxwgmit97do1
3qdntxwgmit97do1· 28d ago

You don't use a belt for timing marks, you use the engine and cam gear markings.   Ignore your mark and do timing properly.

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douB_len28
douB_len28· 28d ago

the marks on the belt were based off the marking on the cam sprocket tooth tho

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LivelyTiger2396
LivelyTiger2396· 28d ago

Common mitsi v6 belt struggle. You would have had it timed correctly but not enough tension between bank one and two along the water pump pulley. People often leave too much slack there. You need start with the water pump and then over both cams so you don’t leave an extra too...

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Lazy_Bear
Lazy_Bear· 28d ago

I usually line up bank 1 exactly and turn bank 2 back about a tooth. Then I put the belt on and turn bank 2 until it takes up the slack and it usually lines up with no slack between the cams. If all the slack isn't on the tensioner side this will happen.

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AhitatedEngine4933
AhitatedEngine4933· 28d ago

C'est exactement ça. J'ai un g6bv un peu différent sur une Kia magentis. Et j'ai eu du mal afin de recalé correctement la courroie. Quand j'ai démonté la courroie n'étais même pas tendu sur les deux brin arbre a cam et pompe a eau au milieu du V. Impressionnant...

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Dark-Mountain511
Dark-Mountain511· 28d ago

So, what if this is an old belt? I haven't installed anything yet, I just noticed when trying to get to TDC that the 2 sprockets looked misaligned by 1 tooth. Both the cams were never able to both have their timing marks line up with the timing mark on the valve covers at th...

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FreeTiger637
FreeTiger637· 28d ago

I don’t know why everyone is talking about the belt. Ignore the belt. You can see the cam to mark is off by a tooth. OP, you need to fix it and then enjoy the better running engine that results. If you don’t know what to do to fix it, take it to someone who does.

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CoolHawk278
CoolHawk278· 28d ago

As a non mechanic, I have no clue what I am looking for. Is the white mark on the sprocket(?) supposed to line up with the cutout in the black bracket behind it?

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EagerOwl994
EagerOwl994· 28d ago

Lol everyone is acting like this is a huge deal/ you dont know what your doing and your gonna total your engine😭 just make sure the crank gear is aligned to tdc marking then if the cam is one tooth off buy a new belt and tensioner and replace them and ensure all timing marks ...

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I_MicrowaveSteak72
I_MicrowaveSteak72· 28d ago

You don't need to mark the belt.... Line up the marks on the engine and install the belt, then turn it over a couple times. Recheck marks.

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Unfair-Nectarine1284
Unfair-Nectarine1284· 29d ago

wait, santa claus eats ass? :(

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JisTin_Godfrey
JisTin_Godfrey· 28d ago

Pic 1 is off by 1 tooth. Pic 2 is so slightly off it could just be from the old belt stretching. Make sure crank is lined up and if so leave everything there. When you go to put the new belt on turn the cam to lineup where it is supposed to. Turning it that little won’t hurt a...

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Hadoq_elagic2
Hadoq_elagic2· 28d ago

Do they belts stretch? I really didn't think they did.

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1jf7zpw_uueeqd
1jf7zpw_uueeqd· 28d ago

So you're saying that once I have my crank lined with it's timing mark, I can get the old belt off and manually move the misaligned cam by hand 1 tooth? Should I make sure I am manually moving it counterclockwise? Or does it need to be clockwise? Or does it not matter at...

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Eager-Lion823
Eager-Lion823· 29d ago

It’s totally possible who ever timed it last was off a tooth as well. Usually would throwing a timing code but it depends on how sensitive the PCM is…. It is … a Mitsu…

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Eager_Cat138
Eager_Cat138· 29d ago

Okay your original question is that you are checking the marks before you even take the old belt off. With that information, looking at your pictures, whoever installed the previous belt has it one tooth off. Just install it correctly when you put the next one on. Remembe...

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johnarosz1990
johnarosz1990· 28d ago

Assuming your 2nd pic is at TDC, it looks correct. If you were to move the belt 1 tooth in either direction, its going to me miles off your timing mark. The marks often don't line up exactly (especially if the head and or block have been skimmed), you just have to set it to th...

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CorgisLion_MaNe
CorgisLion_MaNe· 29d ago

No. 1st pic: left head & cam. 2nd pic: right head and cam.

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Starlight-DuBlanc92
Starlight-DuBlanc92· 28d ago

I concur. If your still worried about it , move it one tooth over and compare. You’ll see this is as close as your going to get.

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Cat_1325
Cat_1325· 28d ago

Tell me more about the evil turd that lives inside your engine and wears a mask like mortan joe

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Quique1224
Quique1224· 28d ago

many reasons why the old belt no longer look aligned. belt stretch is one. purposefully advancing the cam by a tooth is two and there are others depending on the history of the car. only thing that matters is that the marks on the metal pulleys are at TDC. if you do not trust...

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Vast-Ed-9356
Vast-Ed-9356· 28d ago

The belt keeps it in time. To time it correctly you need to align the marks on the cam shafts with the engine at TDC.

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justma-again
justma-again· 29d ago

Use a timing light.

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Inner_Chamistry8971
Inner_Chamistry8971· 28d ago

flash light should do, right?

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wiredmaga_sine
wiredmaga_sine· 29d ago

You are on the left side of a tooth in one picture and the right side of the other. Properly time the engine and do it right if you are concerned about timing being correct

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Archer_8394
Archer_8394· 28d ago

Remove the marks from the belt. They're not helping nor are they straight. Rotate the crank until cylinder one is TDC. Recheck all three timing marks on the gears in relation to the marks on the engine. Lock the cams in position, remove belt, carefully adjust the cam that's ...

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rajapaw_s
rajapaw_s· 29d ago

They were straight enough for me to see that the cams sprocket weren’t both aligned at the same time when the crank was at tdc. Which is my issue

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VampireQuien332
VampireQuien332· 28d ago

It definitely looks like it’s off a tooth. I would put it where it should be and it will probably run better lol. I had an old Honda that was off by a tooth once when I was doing the second belt.

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KitChenRub5768
KitChenRub5768· 28d ago

1st pic is several teeth off isn’t it? The timing cover has the orange mark on a cast marking, and your gear mark is at least 10° off clockwise

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Quick_Badger65
Quick_Badger65· 28d ago

What I dont see anyone mentioning is - are you on the drive side of the belt tension?. Using the crankshaft pulley rotate your engine, by hand, 1/2 turn counter clockwise. Now rotate clockwise back to the timing marks and see how they line up.

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Comfortable_Fall-577
Comfortable_Fall-577· 28d ago

I have the same engine, did mine last year. A little play is normal on these engines but to me this looks 1 tooth off. If you never tightened the tensioner it could have skipped a tooth. Follow the factory service manual. I can dig it out if you cant find it.

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YamIdoingdis2354
YamIdoingdis2354· 28d ago

I hope for your sake this is the non interference 93-older 12v engine and not the later 24v engine because if it's 24v, you're gonna have a bad time.

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WestErnCup7603
WestErnCup7603· 28d ago

silence

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JustinGOdfrey
JustinGOdfrey· 28d ago

I've seen people shift this by putting a screwdriver between the belt and sprocket and rolling it between so it shifts every belt tooth by 1. I've never done it.

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xzIll6
xzIll6· 28d ago

Are you sure the belt on the right way. I made this mistake and it looked similar to your photos.

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HEalthy_Block3036
HEalthy_Block3036· 28d ago

This is the old belt

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ScaLe-Basic
ScaLe-Basic· 28d ago

Your line looks wack

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Fickle_Ad5447
Fickle_Ad5447· 29d ago

The line doesn’t matter

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zzoll_6
zzoll_6· 28d ago

Please stop listening to these people. They have no clue, you marked the locations right. Now with the cams set to how they are in the picture mark the harmonic balancer. With a paint pen like you did with that cams and the timing cover near the balancer making those two marks...

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Ok-Guord4867
Ok-Guord4867· 28d ago

Me its close enough

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Dense-welcome7158
Dense-welcome7158· 28d ago

If a machine shop has milled the cylinder head the belt will be too long & any markings won’t align.

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rajapaw_s
rajapaw_s· 28d ago

Just draw a new line. Should do it....

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JayGatsby_54
JayGatsby_54· 28d ago

Thanks for posting on /r/MechanicAdvice! This is just a reminder to review the [rules](https://www.reddit.com/r/MechanicAdvice/about/rules/). Rremember to please post the year/make/model of the vehicle you are working on. **If this post is about bodywork, accident damage, pai...

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Ok_Dedign_6841
Ok_Dedign_6841· 28d ago

The best way to know if you're one tooth off or not, is to count the teeth. That's what I always had to do on my Nissan VG 30 engines

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lilfaerie7
lilfaerie7· 28d ago

32. I counted all my teeth. But this guy's belt still looks off to him. Now what?

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Patarokun28
Patarokun28· 28d ago

Might have been this way from the factory or the last person who did the belt. I just did a timing belt change. Don’t over think it. Just make sure it’s lined up when you put the new belt on. The cam might slightly move, don’t panic you can move it slightly either direction to...

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WestErnCup7603
WestErnCup7603· 28d ago

*This post was mass deleted and anonymized with [Redact](https://redact.dev/home)* whole elderly subtract badge head cautious shocking sophisticated detail deliver

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VieWNo7459
VieWNo7459· 28d ago

The grove in the top shield

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RobleVi_ejo
RobleVi_ejo· 28d ago

Trust your own alignment and those on the sprockets, it was good. and double check that you have the correct timing belt with the same length and tooth.

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LittleSplif_f
LittleSplif_f· 28d ago

make sure they’re tdc and you can rotate the individual cams with that bolt in the middle there of each cam so you can turn one cam either a little forward or backward to fine adjust.

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GladBadger736
GladBadger736· 28d ago

Pic 2 is in good shape, sorry if I can't see the mark in picture 1. To the best of my knowledge you cant line up the marks with an old belt as it has probably stretched a little. Get it close. Remove everything. Make sure youre at TDC. Line all the marks up. Put the new b...

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g35menaxe
g35menaxe· 28d ago

![gif](giphy|KlmuaUE2Am7UNw9OeD|downsized) It’s a non interference engine. But still, we’re dealing with some dense grey matter here.

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FoxCalm65
FoxCalm65· 28d ago

who told you it’s a non interference? If it were a non interference I’d put a piece of freaking string on these sprockets and call it a day. You may be thinking of the 12 valve 6g72

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Happy_Penguin
Happy_Penguin· 29d ago

I honestly believe you put the belt on backwards, as in the backside of the belt in the photos was the front side when you made the marks. It is not possible for your marks on the belt to align with the cam gears as is shown in the photos. You can even see where your line devi...

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Hadoq_elagic2
Hadoq_elagic2· 28d ago

This belt was installed 50000 miles ago. This is not a new installation. I got one of the cams aligned with it's timing mark, but then noticed the other cam looked off, so I rotated a bit more and drew a line between each cams sprockets mark and the timing mark on their valve...

2
Isa_Me-Afain
Isa_Me-Afain· 29d ago

I’m no mechanic but I’m pretty sure marking a belt means nothing since it’s a third party item and is only there to turn the pullys. The pullys are only thing that should be lined up, not the belt.

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One_Outsude2076
One_Outsude2076· 28d ago

Yup, paint marks are a sanity check, but will work your butt off for that sanity....arms wore out but the warm fuzzies are worth it

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crispy-wolf_16
crispy-wolf_16· 28d ago

You've already messed up. Next time, line up your sprockets with the timing marks first. Mark the old belt where the sprocket marks are before you take it off. After you take it off, count the teeth between your marks and mark the new belt, then install the new belt to match m...

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BadgerBright29
BadgerBright29· 28d ago

I don’t trust paint, the timing mark (on the cam gear) should be more permanent than a dash of paint. Get the service manual for the vehicle/engine and follow what it says for timing.

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Nimja_abdullah
Nimja_abdullah· 28d ago

The cam gear mark is a cut out line from the manufacturer. Paint just helps it stand out more.

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Troumbomb_73
Troumbomb_73· 28d ago

With engines with chains, chains wear and stretch which retards the timing much more than this yet keep on running.

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Eastern_Idea1621
Eastern_Idea1621· 29d ago

Chains have a variable extending tensioner as well as oil controlled variable valve timing to adjust.

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zzikl6
zzikl6· 28d ago

It could be what is known a parallax, that is, the relative position of your view (in this case the camera ) to the line that you are looking at.

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wiredmagazine4
wiredmagazine4· 28d ago

It’s clearly off by a tooth lol

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QuietFalcon7097
QuietFalcon7097· 28d ago

I thought this could have something to do with it. It definitely looked more aligned from certain angles than others. But it definitely looks off to me

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DarkPanda_282
DarkPanda_282· 28d ago

If you need to mark the belt, you have no clue what you are doing....

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FairWhale469
FairWhale469· 28d ago

He marked the belt to reference front of pulley to back. Also, I mark timing belts when I plan the reuse them, and I guarantee you I know what the hell I’m doing. It’s way faster and guarantees it’s in the right spot.

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