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Timing Belt Marks Keep Moving

Help, Advice and DIY Tutorials on Volvo's extremely popular car line -- Volvo's 1990s "bread and butter" cars -- powered by the ubiquitous and durable Volvo inline 5-cylinder engine.

1992 - 1997 850, 850 R, 850 T5-R, 850 T5, 850 GLT
1997 - 2000 S70, S70 AWD
1997 - 2000 V70, V70 AWD
1997 - 2000 V70-XC
1997 - 2004 C70

zupta82
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zupta82

Timing Belt Marks Keep Moving

Post by zupta82 » Thu Jun 27, 2019 5:26 am

[
Hello everyone, I have a 1997 850 and I can’ t keep the timing marks to stay put. I first aligned the marks on the crank and then the cam sprockets right on the money and lock the cams with my iPd tool.When I assembled all the new parts (idler,pump,tensioner), I then wrap the belt around everything and go to pull the pin on the tensioner and find that it keeps jumping about a tooth off when I go to rotate the crank. Should I align the crank and cams about a tooth off to compensate for the tensioner as it begins to re-extend after I pull the pins. This is driving me crazy, my bolts on the sprockets have not been touched . I have enclosed some pics
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RickHaleParker
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Re: Timing Belt Marks Keep Moving

Post by RickHaleParker » Thu Jun 27, 2019 7:25 am

C6357FA7-8D56-4D18-A159-E98E137AA401.jpeg
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Platform: P80 1998 C70, B5234T3, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.

Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0, Plant Torslanda Sweden.
----------------------------------------------------------------
1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

zupta82
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zupta82

Re: Timing Belt Marks Keep Moving

Post by zupta82 » Thu Jun 27, 2019 8:06 am

I’m a little confused do you mean pry up on the roller tensioner arm thing and then pull the pin.



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ZionXIX
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Re: Timing Belt Marks Keep Moving

Post by ZionXIX » Thu Jun 27, 2019 8:27 am

When I changed my belt I had to compensate by moving one tooth in the opposite direction so it would all line up after I released the tensioner. It took me about 10 tries to get right. Just keep trying.



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RickHaleParker
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Re: Timing Belt Marks Keep Moving

Post by RickHaleParker » Thu Jun 27, 2019 1:58 pm

zupta82 wrote:
Thu Jun 27, 2019 8:06 am
I’m a little confused do you mean pry up on the roller tensioner arm thing and then pull the pin.
I think you are not getting the belt tight going counter clockwise from crank, intake and exhaust, when you pull the pin that slack is taken up and that is why you are one tooth off.

I loop around the crankshaft, pull tight and loop around intake, then the exhaust, then push the belt over the tensioner, pull the pin. You got to keep the belt tight through the entire process.


Platform: P80 1998 C70, B5234T3, AW50-42, Bosch Motronic 4.4, Special Edition package, Plant: Uddevalla Sweden.

Platform: X40 (Nedcar) 2003 S40, B4204T3, AW55-50/51SN, Siemens EMS 2000. Plant: Born Netherlands.

Platform P2 2005 XC90 T6 Executive, B6294T, 4T65 AWD, Bosch Motronic 7.0, Plant Torslanda Sweden.
----------------------------------------------------------------
1997 S90, B6304S, AW30-42, Bosch Motronic 4.4 - Sold

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callahanoffroad
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Re: Timing Belt Marks Keep Moving

Post by callahanoffroad » Thu Jun 27, 2019 2:03 pm

RickHaleParker wrote:
Thu Jun 27, 2019 1:58 pm
zupta82 wrote:
Thu Jun 27, 2019 8:06 am
I’m a little confused do you mean pry up on the roller tensioner arm thing and then pull the pin.
I think you are not getting the belt tight going counter clockwise from crank, intake and exhaust, when you pull the pin that slack is taken up and that is why you are one tooth off.

I loop around the crankshaft, pull tight and loop around intake, then the exhaust, then push the belt over the tensioner, pull the pin. You got to keep the belt tight through the entire process.
This is a really good tip 👌


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misha
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Re: Timing Belt Marks Keep Moving

Post by misha » Thu Jun 27, 2019 4:22 pm

You don't need cam locking tool at all.


'97 850 2.5 20v /fully equipped/ Motronic 4.4 / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
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erikv11
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Re: Timing Belt Marks Keep Moving

Post by erikv11 » Thu Jun 27, 2019 5:07 pm

(1) cam locking tool is probably making things worse, see my suggestion (3) below which can not be done with a cam lock tool

(2) use the standard procedure: always start on the crankshaft then proceed from the right (install belt counterclockwise). Pull the belt tight over intake sprocket, then over exhaust sprocket, etc.

(3) BUT after everything is perfectly aligned and ready to go but before you start putting on the belt, cheat both of your cam sprockets about 1/2 of a tooth to the right (clockwise). This will greatly simplify keeping the belt tight as you traverse through the sequence. Be careful, the exhaust cam wants to jump due to cam lobe pressure, be patient you can get it to sit where you want it.

(4) check the marks when you are done, make sure you rotate a full cycle of the crank by hand and check them again.

You will find suggestion (3) to be super useful!


'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 140k
'98 S70 NA, 210k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 280k
'06 S60 R, 160k
gone: '96 NA 850 210k, '98 NA V70 182k

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Re: Timing Belt Marks Keep Moving

Post by tardcart » Thu Jun 27, 2019 7:27 pm

you show being half a tooth off which is not possible. are you turning clockwise to test alignment? (front of engine)



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erikv11
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Re: Timing Belt Marks Keep Moving

Post by erikv11 » Thu Jun 27, 2019 8:11 pm

Likely the angle of the pics is misleading. It's going to be off a whole tooth, and OP does say that in the first post.


'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 140k
'98 S70 NA, 210k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 280k
'06 S60 R, 160k
gone: '96 NA 850 210k, '98 NA V70 182k

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