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S70 Engine

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

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erikv11
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erikv11

Re: S70 Engine

Post by erikv11 » Wed Jan 01, 2020 12:00 pm

I see you did a bunch of head work, did that include new valve stem seals? If not that could be another source of oil consumption. Also is a contributing factor to burnt valves.

(a) run as is adding oil
or
(b) replace the engine. Don't put in one with badly leaking valve stem seals. Also swap over all timing parts, replace cam seals, rear main seal.
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Thomas and Judith Lilli
'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, 285k
'06 S60 R, 160k
gone: '96 NA 850 210k, '98 NA V70 182k

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E Showell
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E Showell

Re: S70 Engine

Post by E Showell » Wed Jan 01, 2020 4:15 pm

I speak Steve, that's Ph. D. for "almost."
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Thomas and Judith Lilli
'98 V70 NA FWD 5 spd, silver sand metallic (sold)
'99 V70 NA FWD Auto, dark blue (actively for sale)
'99 S70 NA FWD Auto, black (sold and resurrected -- Don't cry for me Argentina . . . )
'07 S80 3.2 FWD Auto, Barents Blue Metallic
'06 V70 R AWD Auto, Sonic Blue Metallic
'04 XC70 Ruby Red Metallic

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abscate
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abscate

Re: S70 Engine

Post by abscate » Wed Jan 01, 2020 5:39 pm

E Showell wrote:
Wed Jan 01, 2020 4:15 pm
I speak Steve, that's Ph. D. for "almost."
:lol: corrected above
Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
Link to Maintenance record thread
Link To Volvo Glossary

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Re: S70 Engine

Post by Thomas and Judith Lilli » Tue Jan 07, 2020 3:04 am

Yes, the head was professionally worked.

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Re: S70 Engine

Post by Thomas and Judith Lilli » Tue Jan 07, 2020 3:19 am

Sorry Gents, once again, I’m not getting notifications on this thread.

I would not have thought about an O2 sensor causing a burnt valve but, I just replaced the exhaust system and replaced the Heated O2 with the CCV. Curious how an O2 sensor would effect one cylinder as I thought it trimmed all fuel. Interesting. I do run the highest Octane I can get on every tank full although my wife generally drove the car and, like I said we’ve had it since it’s had about 40,000 miles (2002) so what’s that about 8000 per year but I’m driving it now so it will do much more. I have noticed the consumption of oil eased a little since we replaced the exhaust. I was thinking maybe the increased back pressure from the CCV being clogged might have pushed oil out if the recovery system in the crank case.

Thomas and Judith Lilli
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Re: S70 Engine

Post by Thomas and Judith Lilli » Tue Jan 07, 2020 3:22 am

Also, will a professional diagnostic machine pick up poorly functioning O2 sensors?

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E Showell
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Re: S70 Engine

Post by E Showell » Tue Jan 07, 2020 5:16 am

Here's my theory on the O2 sensor. They degrade slowly over time. Mine did not trigger a code. One possible mode of failure is to progressively lean out the mixture (you may notice a slight increase in fuel economy). Extra strain on the engine during say a prolonged highway Hill climb generates just enough extra heat to blowtorch the valve.
'98 V70 NA FWD 5 spd, silver sand metallic (sold)
'99 V70 NA FWD Auto, dark blue (actively for sale)
'99 S70 NA FWD Auto, black (sold and resurrected -- Don't cry for me Argentina . . . )
'07 S80 3.2 FWD Auto, Barents Blue Metallic
'06 V70 R AWD Auto, Sonic Blue Metallic
'04 XC70 Ruby Red Metallic

Chuck W
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Re: S70 Engine

Post by Chuck W » Tue Jan 07, 2020 7:17 am

Pick up a good-running used motor. Swap it, and be on your way.

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