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Cam/cover question 98 s70 glt Topic is solved

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

stephansvolvo
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Cam/cover question 98 s70 glt

Post by stephansvolvo » Sun May 31, 2020 12:30 am

Putting new head on all is well up until now.
Putting the cams in, no problem except they were sitting up on the backside. I put the cam cover on( drew it down slowly) checked the back as I was tightening it down and after the last pass I realized the cams were off. I tried to rotate the cams and I could not. Marks down below on and of course the timing marks on the cams are off.
My question is
1) why can I spin it freely?
2) Am I going to have to take the cover back off to fix the timing?
3) what would have caused the backside of the cams to sit higher?

Thanks
Stephan
84 240GL my first(sold)
88 240GL(timing belt killed it)
98 V70 GLT

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erikv11
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Re: Cam/cover question 98 s70 glt  Topic is solved

Post by erikv11 » Sun May 31, 2020 12:48 am

Cover has to come off to free up the cams, be sure to inspect for minor cracks in the cam slots in the head. Cracks there are not deal breakers but they can happen.

The cams don't sit flat because the cam lobes are in various directions, some hitting valves some not. Basically they don't sit flat because, well, they don't. It's very important to draw the cams straight down as you put the cover on or you can damage the grooves/guides in the head adjacent to the cam seals, where the cams sit. The head casting is thin there and can crack. Cam tools make it easier to lower the cover straight down but they are definitely not required. My guess is the cams are wedged into the grooves, instead of sitting in nicely.
These users thanked the author erikv11 for the post:
stephansvolvo
'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

stephansvolvo
Posts: 320
Joined: Mon Nov 25, 2013 3:36 pm
Year and Model: V70 GLT 1998
Location: Longbeach, WA
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stephansvolvo

Re: Cam/cover question 98 s70 glt

Post by stephansvolvo » Sun May 31, 2020 12:53 am

erikv11 wrote:
Sun May 31, 2020 12:48 am
Cover has to come off to free up the cams, be sure to inspect for minor cracks in the cam slots in the head. Cracks there are not deal breakers but they can happen.

The cams don't sit flat because the cam lobes are in various directions, some hitting valves some not. Basically they don't sit flat because, well, they don't. It's very important to draw the cams straight down as you put the cover on or you can damage the grooves/guides in the head adjacent to the cam seals, where the cams sit. The head casting is thin there and can crack. Cam tools make it easier to lower the cover straight down but they are definitely not required. My guess is the cams are wedged into the grooves, instead of sitting in nicely.
I guess I’ll need to clean the head and cover the reapply the sealant?
Stephan
84 240GL my first(sold)
88 240GL(timing belt killed it)
98 V70 GLT

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erikv11
Posts: 9771
Joined: Sat Jul 25, 2009 2:03 pm
Year and Model: 850, S/V70, 06 S60R
Location: Iowa
Has thanked: 101 times
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erikv11

Re: Cam/cover question 98 s70 glt

Post by erikv11 » Sun May 31, 2020 12:57 am

Yes, unfortunately!
'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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