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Volvo 850R Timing Belt Question

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

jonslave
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Volvo 850R Timing Belt Question

Post by jonslave » Wed Jun 03, 2020 3:37 pm

Yet another one....

Lining things up again after a timing belt change over here.

Looks like my absolutely teeny tiny tick (almost non-existent, sheesh) in the crank pulley lines up properly with the pointer on the block with the cams this far out from the timing marks. (Could not get a clear pic of the crank with my phone and light source)

My questions are:

1. If I lined up the cam marks when I started and used a lock tool pressed into their teeth, how could this car have started and ran so well before I changed the belt?

2. Is there another way to confirm crank timing beyond that scary tiny tick?

3. If I'm sure this is right now, do I rotate the cam sprockets to match the crank alignment or vice-versa?

Thank you!
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misha
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Re: Volvo 850R Timing Belt Question

Post by misha » Wed Jun 03, 2020 4:04 pm

I never used cam locking tool and never had cams or crank moved when replacing the timing belt.
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS

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erikv11
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Re: Volvo 850R Timing Belt Question

Post by erikv11 » Wed Jun 03, 2020 4:34 pm

Cams always move when I do this job, well the exhaust cam does.

Your suspicions are correct, there's no way that is on the crank mark, that's too far out for it to run well. Keep looking; are you sure it's not there when the cam sprockets are lined up with the tick marks? Also there is a tick mark on the edge of the crank pulley, that you can use to help you find the teeny tiny mark. But you must go by the crank pulley mark.


Oh and (3) you become certain the crank is correct, then put the cams where they need to be. When the crank is on the timing mark the pistons are out of the way and the cams can be turned however they need to be, do whatever you want as long as the cams are set right before you move the crank again.

I need to run but here is some info from another MY, may be helpful: viewtopic.php?f=1&t=83534
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jonslave
'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 145k
'98 S70 NA, 220k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 286k
'06 S60 R, 167k
'99 Camry V6 :shock: 125k
gone: '96 NA 850 210k, '98 NA V70 182k

jonslave
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jonslave

Re: Volvo 850R Timing Belt Question

Post by jonslave » Wed Jun 03, 2020 5:05 pm

Great info thank you. Just looked again with a high lumen flashlight and can confirm the mark lines up with the pulley in the photo cam position. Also confirmed with the mark on the balancer lining up with the mark on the block. Strange. I must have done something.

I can easily rotate the engine by hand, just curious, what is the maximum number of teeth the cams can be off before catastrophe?

Will take the belt off and line up cams. Do I need to find the tensioner pin again??

Thanks again.

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erikv11
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Re: Volvo 850R Timing Belt Question

Post by erikv11 » Wed Jun 03, 2020 8:27 pm

After you align the cams, you indeed have to remove and recompress the hydraulic tensioner and lock it with the pin before you can reassemble. Compress the tensioner slowly as per usual. If you can't find the pin, people often use a very small Allen key as a substitute.
These users thanked the author erikv11 for the post:
jonslave
'95 854 T5-R, Motronic 4.4, 185k
'96 855 NA, 145k
'98 S70 NA, 220k (living out west)
'98 V70, T5 tune-injectors-turbo, LPT engine, 286k
'06 S60 R, 167k
'99 Camry V6 :shock: 125k
gone: '96 NA 850 210k, '98 NA V70 182k

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misha
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Joined: Sun Dec 07, 2008 4:09 pm
Year and Model: '97 850 2.5 20v
Location: Serbia
Has thanked: 57 times
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Serbia
misha

Re: Volvo 850R Timing Belt Question

Post by misha » Thu Jun 04, 2020 1:55 pm

jonslave wrote:
Wed Jun 03, 2020 5:05 pm
...just curious, what is the maximum number of teeth the cams can be off before catastrophe?
Up to 3...more than that is game over.
'97 850 2.5 20v / fully equipped / Motronic 4.4 from the factory / upgraded with S,V,C,XC70 instrument cluster / polar white wagon
'91 Citroen XM 2.0 SI /fully equipped/mandarine red metallic
History of Volvos in the family:
'71 144 S
'73 144 De Luxe
'78 244 DL
'78 244 DL
'79 244 GLE
'85 340 GLS

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