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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

Thomas and Judith Lilli
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Thomas and Judith Lilli

S70 Engine

Post by Thomas and Judith Lilli » Sat Dec 28, 2019 6:28 am

Hey,

We’ve discussed briefly my issue with my 99 S70. My conundrum is that I’ve spent lots of money on some repairs and now I found I have a scored cylinder. Brief review.
Nov/16 Tune up resulted in broken plug in #5 cylinder. Removed head, found spark plug debris in valves. Removed and replaced both valves, lapped, reassembled. Later noticed high oil consumption. Mar/19 Suspected turbo, replaced turbo and PCV system. Oil consumption remained. July, burnt #5 cyl exhaust valve.
Removed and refurbished head with new exhaust valve. Noticed scoring in cyl 5.
Reassembled and running car with oil consumption. 1 qt/1000 miles.

I’ve got new drive train, turbo, head, exhaust system and many other consumable parts have been replaced. Body is without rust.

I’m considering a replacement engine for the oil consumption. Would you all rebuild what I have or buy a remanufactured unit?

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E Showell
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E Showell

Re: S70 Engine

Post by E Showell » Sat Dec 28, 2019 8:00 am

Neither. Were it me, I'd try to find a lowish mileage used unit and replace with used.

I am certainly no engine rebuilder, but I haven't heard much about honing cylinders to remove scoring. Most of the time when these engines are opened up for valve replacement, people comment that the original cylinder machining marks are clearly visible still, even after a couple hundred thousand miles. Not sure whether you'd have to overbore to remove the scoring, or even whether oversize pistons are available.

I think Bob Elwood of Elwood Industries in FLA. (seller of replacement Volvo seat covers) may have rebuilt a white block.

You may want to reach out to him. Good luck and let us know what you end up doing.

On the other hand, if money were no object, I'd get a crate engine from Volvo if available, just know that when you clip that first 🦌 you won't get your money back on the insurance claim.
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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 » Sat Dec 28, 2019 2:46 pm

I’ve got a decent short block up here. High miles but from a good runner

For a 1999 turbo you will need a pn engine with exhaust VVT to work with your ECU
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Empty Nester
A Captain in a Sea of Estrogen
1999-V70-T5M56 2005-V70-M56 1999-S70 VW T4 BMW
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volvolugnut
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volvolugnut

Re: S70 Engine

Post by volvolugnut » Sat Dec 28, 2019 5:38 pm

Call me a red neck, but if it runs ok and looks ok, I can carry oil and put in oil every 1000 miles. At that consumption, it likely still does not embarrass you by smoking on acceleration.
volvolugnut
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Thomas and Judith Lilli
2001 V70 T5, 1986 244DL, 1983 245DL, 1975 245DL, 1959 PV544, multiple parts cars.

cn90
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Re: S70 Engine

Post by cn90 » Sun Dec 29, 2019 8:52 am

This is waht I did when my 1998 S70 GLT with 190K had a burned valve #3 and trans losing reverse, I sold the car to a used car dealer for $300.
I bought a nice 2004 V70 with 100K for $4200.
On the long run, you are better off with a P2 car with 2.5T.
Don't sink money into P80, especially when the odo > 180K.

What is your odometer reading?
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E Showell
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E Showell

Re: S70 Engine

Post by E Showell » Sun Dec 29, 2019 8:57 am

On reflection, I'd part it out. That's likely your best economic return, though it may take some time.

The reason I would do so is threefold:. If you haven't already fixed the throttle body, you will need to do so eventually (XeModex rebuild runs close to $500), pretty soon there will be few buyers for P80 parts due to most of them coming off the road, and it will become increasingly difficult to source replacement parts if you are banking on running the car into the ground.

So, part out, or top up oil every 1k seem like your most sensible options.
Last edited by E Showell on Wed Jan 01, 2020 8:21 am, edited 1 time in total.
These users thanked the author E Showell for the post:
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

Thomas and Judith Lilli
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Thomas and Judith Lilli

Re: S70 Engine

Post by Thomas and Judith Lilli » Wed Jan 01, 2020 6:47 am

hey all, sorry, didn’t get notifications to your responses.

We’ve got 185000 on it. I’ve owned it since it’s had about 40,000 miles and have done nothing but run mobile one it it and routinely maintained it. Very little corrosion and other than oil consumption, runs strong. I’m wondering, with a scored #5 cyl, would oil consumption be due to increased crank case pressure from blow by at the rings during compression and combustion blowing some oil out the breather and then back into the intake manifold through the turbo?
I have been concerned about burning a valve again in a year or two but, maybe that wouldn’t be the case. Also, is there a plausible explanation for some sort of issue causing burning valves in this engine that I could keep ahead of such as fuel injectors, lousy gas etc? (I’m running premium fuel).

If I can get my moneys worth out of these repairs, (18 months, then I’ll be happy, if it makes it to 2024 that would be a blessing)

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E Showell
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E Showell

Re: S70 Engine

Post by E Showell » Wed Jan 01, 2020 8:25 am

My own, entirely unscientific suspicion with burned valves is that failing to replace front O2 sensor as a maintenance item at 100,000 miles is a contributor, as is low octane, generic gas use and overly extended oil change intervals.

P.S. #5 valve is not usually the one to go. Generally #2 or 3. I think most commonly #3.

Ok, reading back through I see that you've already burned one valve in that engine. Accordingly, I'd either keep running it as is and adding oil, or pull and replace with a used engine. Engine swap is going to be about 18 hrs labor charge from mechanic. Cylinder head is about 15. And, of course, if you DIY, the labor is "free."
These users thanked the author E Showell for the post:
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 9:16 am

Do you run light (5000 miles per year) or heavy (20,000 per year)?


It isqalmlst is almost always cost effective to repair a light running car vs buying a new set of problems.

My gut feel is valve burning seem pretty rare and uncorrelated. Evans factors above definitely will put things in your favour at low cost of repairs.

There are lots of examples here if people who burn valves, pull the head, replace just the one valve , rework the head, d drive another 100k
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Thomas and Judith Lilli
Empty Nester
A Captain in a Sea of Estrogen
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crlande
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crlande

Re: S70 Engine

Post by crlande » Wed Jan 01, 2020 10:40 am

"isqalmlst".......I would try to scrabble the living daylights out of that one on the college smarty!!

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