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> Engine Compression, 95 850 turbo
kiakid2007
post Apr 21 2009, 04:17 PM
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need some help been looking for 2 days and cant find compression specs for the 850 turbo, with as many people on here have done headgaskets someone is sure to know please share this info so i can figure out if i need to pull the head off or look for something else causing the problem thanks to all (IMG:style_emoticons/default/liebe011.gif)
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TheGreekMason
post Apr 21 2009, 04:19 PM
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kiakid2007
post Apr 21 2009, 04:22 PM
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i did a compression test and have 120 on 3 cylinders and #2 has 110 and #3 has 130
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some-beach!
post Apr 21 2009, 07:24 PM
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QUOTE (kiakid2007 @ Apr 21 2009, 05:22 PM)
i did a compression test and have 120 on 3 cylinders and #2 has 110 and #3 has 130


They should be between 189-219 PSI [no more than 20 PSI between any] when a compression test is performed on a normal operating temp engine.

How did you do the compression check? Cold engine or normal operating temp? Dry or wet test?

Your #'s are low but it depends on how it was done.

For example, my #'s, checked correctly were 190-200 across the board on a 200+k motor which is excellent.

A blown head gasket usually will show a sharp difference on 2 adjacent cylinders, from the others. Your low #'s are probably due to testing a cold engine?
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kiakid2007
post Apr 21 2009, 11:40 PM
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you are correct the engine was cold and it was a dry test
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some-beach!
post Apr 22 2009, 06:16 AM
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QUOTE (kiakid2007 @ Apr 22 2009, 12:40 AM)
you are correct the engine was cold and it was a dry test


I really don't know what the cold #'s are but the range themselves aren't that bad and within the 20 PSI variation guideline. I just don't see anything in those #'s to say it looks like there's a problem, like a 60 or 80 in one or 2 cylinders would show. #'s can vary a few degrees [within 20 PSI] due to many reasons, carbon build up on a valve/seat, etc... which can usually be corrected by running some cleaner like SeaFoam through.

You checked it with the throttle plate open and let it go 3-5 rev's, recording the highest #'s, correct? Can you do it again only at normal operating temp? Some issues only show when it's warm [a crack would expand, etc...]

Make absolutely sure your new thermostat is working [they can be bad right out of the box]. I always check mine in a boiling pot of water. With a thermometer, you can tell if it's opening and when it should. Make sure the cooling system is clean and clear, flush it very well and make certain there are no air pockets. An air pocket can cause problems as well as a clogged or collapsed hose or blocked radiator. When up to normal operating temp, squeeze the upper radiator hose shut with your hands, then release after a few seconds and you should feel a rush of coolant. If not, your water pump could be weak as well.
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kiakid2007
post Apr 22 2009, 07:24 AM
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a little back ground info the car was overheating because coolant is being pushed out of the bottle so i replaced the thermostat i did check both new and old in hot water old would not open even in boiling water new was fine so i figuered i was good but it was still being pushed out so i started thinking headgasket figuring exhaust was getting into coolant forcing it out so i did the compression test and replaced the cap and it a little better now but still losing coolant. so now im left trying to figure out why there is so much pressure in the cooling system
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some-beach!
post Apr 22 2009, 08:02 AM
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QUOTE (kiakid2007 @ Apr 22 2009, 08:24 AM)
a little back ground info the car was overheating because coolant is being pushed out of the bottle so i replaced the thermostat i did check both new and old in hot water old would not open even in boiling water new was fine so i figuered i was good but it was still being pushed out so i started thinking headgasket figuring exhaust was getting into coolant forcing it out so i did the compression test and replaced the cap and it a little better now but still losing coolant. so now im left trying to figure out why there is so much pressure in the cooling system


Yeah, I remember your other thread and the history. Are you sure the cooling system is clear with no air pockets, the water pump is working, thermostat is opening fully [not upside down] and when it should, the hoses are good and the overflow cap is good?
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ampangbear
post Apr 22 2009, 08:55 AM
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QUOTE (kiakid2007 @ Apr 22 2009, 05:22 AM)
i did a compression test and have 120 on 3 cylinders and #2 has 110 and #3 has 130


I think i answered this already in another thread. But let me expand that a tad.
Yes, it was here: http://www.volvo-forums.com/t25997-1995-vo...overheating.htm

At this age, yes, this kind of reading IS low. Too low for a turbo-charged engine anyway. But at the same time, if the reading is uniform, i will wait till it really go bust before spending all that money into it.

If you're getting 185, you should be very happy already. If you're getting 200 like beach, hey, like he said, its excellent. But the performance at between 160 to 190 is not something you can see a difference from.

At that reading you're getting, it can still be good for a couple of months probably, who knows. (IMG:style_emoticons/default/smile.gif)

But your initial problem, if i remember correctly is overheating, right? Hmmm, i dont think by making your compression better, your overheating problem will go away. Well, please tell me if i am wrong. (IMG:style_emoticons/default/smile.gif)
Or if you've already mentioned it before, please forgive my absent mind.

Cheers.
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kiakid2007
post Apr 23 2009, 12:35 AM
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i know it was in another thread but i was looking for the compression specs here but i did the test cold and will now do it at operating temp. new thermostat and coolant cap, not losing coolant as bad but still filling it up every other day and wanted to see if the headgasket was blown, not sure about the water pump but i will do the timing belt and water pump this weekend when i get the parts in
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TheGreekMason
post Apr 23 2009, 04:03 PM
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sorry, i didn't realize what you wanted with your post.
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kiakid2007
post Apr 23 2009, 04:57 PM
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please dont take it the wrong way but bear mentioned that there was another thread if you can help in any way please do im almost to the point of selling but really dont want to just want it right
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some-beach!
post Apr 23 2009, 09:44 PM
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You need to go through the cooling system completely to diagnose exactly what's going on before proceeding and just throwing parts on it.
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ampangbear
post Apr 23 2009, 11:06 PM
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Dont worry about it, Greek!
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KiaKid,
If you're any nearer, i'd volunteer to help you troubleshoot the problem again, ONE by ONE. Which is how i think you should be progressing form now onwards for the overheating problem. Go through each item, ONE by ONE, and take pics for us as well.

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kiakid2007
post Apr 24 2009, 12:29 AM
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the next thing on my list is a compression test ( operating temp ) to look at the compression if its not right im gonna pull the head and replace the gasket and have the the head checked. and if money looks good ill pull the pan and replace the bearings and rings since ill be half way there already and the car has 200k. so with that being said ill let you guys know how the compression looks on saturday
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Ryan 20
post Apr 24 2009, 03:17 PM
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Here's a link that says the engine compression http://www.vlvworld.com/indexframe.html?engspecs.html
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ampangbear
post Apr 28 2009, 05:41 AM
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Thanks Ryan.

Keep us updated, KiaKid. And you know what? Based on the VLV site, i think you should just go ahead and fix the head.
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Ryan 20
post May 1 2009, 07:59 PM
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I would check the compression when the engine is hot with throttle open. And remember the 2.3 turbo engine has lower compression then the 2.4 NA engine.
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ampangbear
post May 6 2009, 03:32 AM
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Is it fixed yet?
Any updates?

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kiakid2007
post May 6 2009, 10:21 PM
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no im pretty much lost. i dont know what is pushing the coolant out of the bottle the compression is good and also did a fluid check and it stayed blue so i dont think the headgasket is blown but the pressure is coming from somewhere but i dont know from where
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