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C70 sad story

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

dobrosailor
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C70 sad story

Post by dobrosailor » Sat Jan 04, 2020 8:22 am

I had a 2002 C70 overheat and I added cool water to a running overheated motor creating a metallic pop sound whereby water is dumping out the back of the motor at an alarming rate. THe car also is running on 3-4 cylinders now. I figured I roached the 160k motor and parked an otherwise georgous C70 coupe about 4 months ago. In speaking with the local Volvo whisperer he is convinced that the motor is fine likely blew a hose off the turbo or heater and has a blown headgasket and/or burnt valve(s). I have replaced a head on a 98 V70 so I am not afraid to dive in but have a couple of questions.

First, I think my 2002 hi pressure turbo motor may have VVT. Is that an issue or can I remove the cam and replace it as a unit without needing the cam tool? In otherwords, if I do not mess with removing the sprocket from the cam, can I treat the cam as a regular cam or am I forced to purchase a cam tool?

Do these blocks/heads have anyplace that crack that I should check before diving into an ugly process.

Finally, one of the worst days of my long hobby mechanicing history was putting the two 10 mm bolts in the water pipe behind the number 1 cylinder up against the fire wall. Any tricks on this?

Thanks!

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Re: C70 sad story

Post by June » Sat Jan 04, 2020 9:05 am

Cold water in a overheating aluminum engine = TRASHED engine especially with a metallic pop sound and immediately misfiring. I would not waste money fooling around with the engine unless you put a complete used unit in.

Sure a old American V8 with cast iron block and heads likely would survive cold water in a running overheated engine until that one time...

Also if you overheated the engine you overheated the transmission so a fluid replacement would be in order. Consider this a learning experience and never do that again. June
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dobrosailor
My Volvo cars owned
1989 740 GLT ordered
1994 850 4door standard shift ordered
1996 960 ordered
1998 S90 ordered totalled after 3 weeks
1998 V70 GT dealer stock car
2002 S80 T6 ordered totalled
2004 S80 T6 dealer stock car and current car owned

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Re: C70 sad story

Post by callahanoffroad » Sat Jan 04, 2020 5:55 pm

I would start with identifying the leak. Is it from the block? Is it from the hose? If you have a cracked block then you just need to swap the motor out. A busted hose isn't very difficult.

I don't have any experience with the vvt engines so I can't help there.

But as June suggested it may actually be easier and cheaper/more cost effective to swap the engine with a used engine.
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Re: C70 sad story

Post by j-dawg » Sun Jan 05, 2020 1:56 am

dobrosailor wrote:
Sat Jan 04, 2020 8:22 am


Finally, one of the worst days of my long hobby mechanicing history was putting the two 10 mm bolts in the water pipe behind the number 1 cylinder up against the fire wall. Any tricks on this?
- Make sure the gasket is captured when you're installing screws, and make sure it's not in the way of the screws too
- Make sure you've pushed the pipe laterally to the right position as the holes may be misaligned even if the flange is flat on the head
- Tape your bolts to a socket and mount it on an extension to get them started
- Buy an inspection mirror and magnetic pickup tool if you don't have them already
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1999 V70 T5 5-SPD | ~270k mi | burns more oil than gasoline

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Re: C70 sad story

Post by dobrosailor » Sun Jan 05, 2020 7:40 am

So after the first response, I started looking for motors and T5 "53" motors are plentiful and some are not badly priced, found a couple in the 107-125k +mi. Couple of questions:

1) I had to clean out the trans solenoids one time to clear up a trans flair issue. It was slowly coming back so I need to do it again only this time I'm gonna drill out the solenoid bodies so that fluid can flow through making them self cleaning. The issue is that the solenoid is magnetic and tends to fill the solenoid with thick metallic laden fluid. You can't really see flakes or anything but its definitely dark grey compared to the rest of the fluid and a LOT thicker. When I cleaned out all three solenoids the first time the trans shifted like new for about 40k miles then started infrequently flairing occasionally. Having been through this before, I know it will only get worse.

Question #1 is it easier to pull the trans and engine - I am tempted to buy an Engine / trans unit since they appear to be cheap. clean the solenoids while out and replace. This would drop 50k miles off the trans and make access to the solenoids much easier. Does a trans/engine unit have to come out with the subframe below or can it come out on top, Youtube shows both ways.

2) Can the motor be pulled with the turbo and exhaust manifold attached? Looking for two answers, a) if motor is disconnedcted from the trans and b) if motor and trans are removed as a unit. Turbo needs to be replaced also...

Thanks!

M

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Re: C70 sad story

Post by erikv11 » Sun Jan 05, 2020 8:56 am

(1) If I was doing just an engine swap, engine out the top with trans attached is the way I prefer to do it anyway. Yes they come out together pretty easily.

(2b) I usually remove the turbo first but I think some people leave it on. It's definitely tight in there if you leave it on. I'd look for more replies on this one. I have to basically lay on top of the engine to pull the turbo, that part is not so pleasant but still not difficult.

Definitely replace the rear main seal and transmission seal while it is out and apart. Only buy quality seals, Volvo or Corteco. Clean up the steering rack while it is accessible and staring you in the face. Axle seals less important but they could be done now too.
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dobrosailor
'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, 165k
'99 Camry V6 :shock: 125k
gone: '96 NA 850 210k, '98 NA V70 182k

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Re: C70 sad story

Post by dobrosailor » Sat Feb 01, 2020 7:24 am

Turns out T5 engines are pretty common and not badly priced. I found one with 107k delivered to my door for $650 with turbo. Another with 69k for 650 likely no turbo, he has had the motor 6 years, thinks its likely the turbo has been sold but if its there he will include it - no shipping included. One other motor with 39k for $1400 no turbo close enough to pick up. My turbo is shot.

On the fence, the 69k is two years of service more than the 107 at 20k / year I drive but likely $200 more to my door plus turbo. I've had two turbo white motors burn a valve at 166k so I see that as a milestone with these carz.

These are junkyards and they do not pickle the motors, just tape up the orifices and put them on a shelf. Think its ok for a motor to sit 6 years and fire up like it was yesterday? I will put timing belt, tensioner and water pump in. Considering rear main seal and trans seal as noted above, anything else I am likely to run into in this quest I need to be prepared for? I've never done a volvo R&R before but lots of other cars e.g. saabs fords Hudsons Triumphs etc...

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abscate

Re: C70 sad story

Post by abscate » Sat Feb 01, 2020 7:42 am

$650 is 2x too much for a 6 year sitting engine with no pickling. There is a lot of rework to be done on that motor.

Miles are neither verifiable nor too relevant - its all about history of the motor and how it was treated.
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dobrosailor
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Re: C70 sad story

Post by dobrosailor » Sat Feb 01, 2020 7:42 am

Getting ready to pull the trigger: I found lots of T5 motors reasonably priced but transmissions are at least a grand so I'm gonna stick with my trans and clean the solenoids once again. As for motors; I found one with 107k delivered to my door for $650 with turbo. Another with 69k for 650 likely no turbo, he has had the motor 6 years indoors on a shelf, thinks its likely the turbo has been sold but if its there he will include it - no shipping included. One other motor with 39k for $1400 no turbo close enough to pick up. My turbo is shot.

On the fence, the 69k is two years of service more than the 107 at 20k / year I drive but likely $200 more to my door plus still gotta find a turbo. I've had two turbo white motors burn a valve at 166k so I see that as a milestone with these carz. My turbo whines so I do not think its rebuildable according to the rebuild kit guys.

These are junkyards and they do not pickle the motors, just tape up the orifices and put them on a shelf. Think its ok for a motor to sit 6 years and fire up like it was yesterday? I will put timing belt, tensioner and water pump in. Considering rear main seal and trans seal as noted above, anything else I am likely to run into in this quest I need to be prepared for? I've never done a volvo R&R before but lots of other cars e.g. saabs fords Hudsons Triumphs etc...

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Re: C70 sad story

Post by dobrosailor » Sun Feb 02, 2020 5:28 am

Do you have an angle on a cheaper option, I would love to pay 325 for one. The issue in your mind is how long it sat? The best I found is 400 for 107k.

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