Volvo V70 XC wont start, no compression cylinder 1,3,5.

[greyfoxisa]

Alright i confirmed the timing was good so i bit the bullet and removed the timing cover and camshafts in a last ditch hope that i was just getting the timing wrong. I ran the compression test on each cylinder with it at the bottom that way if the valves are all shut which they should be, you would get some compression. Again cylinders 2 and 4 had compression, 1,3,5 had none. So i will be taking the head off AGAIN on Monday to see what the issue with it is.

Another question, i replaced the head gasket right before this with a felpro and used copper petmatex gasket spray on it, should it be safe to re-use this? Also i installed new head bolts, my assumption that even though they are new, i should replace them AGAIN to be on the safe side correct?

[Billc1015]

You never want to re-use a headgasket. They are a 1 time use only.

[regent]

Would not re- use the head bolts, either - they've already been stretched. Use new; this rule applies to ALL fasteners that are subject to angle-torqueing!

[greyfoxisa]

Alright, now quick question when i did the timing before i used the timing marks on the camshaft gears, can i just use the ends of the camshafts with the slots to put them in at TDC or do i have to use the timing marks?

[greyfoxisa]

Oh and i am assuming i will need to replace some valves, i am just going to pull some good ones from a junker, what other models are compatible for the valves for this car, again it is a 99 volvo v70 xc AWD turbo 2.4l

[Faust]

Not a Volvo expert by any means,but I have been around a few engines. First "no" compression in 3 cylinders diminishes my inclination to suspect a bad gasket. It is just "too bad". I am also not giving much thought to holes in three pistons. My first thought would be valve timing, this should be easy enough to determine without disassembly. As to the intake valves, I am wondering if you could hear compression leakage through the intake. The next thought is bent valves. Is it possible to measure valve spring height on the Volvo? Using the two known good cylinders as "controls" it should be possible to locate "short" valves. If they are bent enough to produce "no compression" they should appear "short".

If the engine is being turned by hand, I would expect some leakage of compression. Perhaps enough to give readings of no compression.

[greyfoxisa]

Alright i opened her up today, head bolts where not that tight, i think what happened when it was having the random misfires it cause the timing belt to jump because all the valves hit the pistons, i think that is what caused the head bolts to stretch a little more which is why they were not as tight as they should be. I am thinking i should just pull a whole cylinder head from a junked one just to be on the safe side because i am worried the shafts for the valves might be messed up from them getting hit. Also do i need to worry about the pistons? There are indentations where the valves hit.

Would a 2000 S70 2.4L cylinder head fit it?

[Billc1015]

When I worked at the dealer I had an S80 T6 that the belt jumped and bent all the valves. I was able to just replace the valves. The pistons were fine.


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[greyfoxisa]

Thanks bill, i did some searching around and it seems that the pistons pretty much never get damaged enough to need repairs from a valve hitting them. Question remains though should i replace the cylinder head? or just the valves? i am going to pull the valves out tonight with my spring compressor and see what the condition of the seats are.

[Billc1015]

Make sure you check the valve guides. I have seen those crack from valve hits before. I can't remember if it was on a Volvo engine or not.


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