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850 T5 B5234T engine fault please help me!

I bought 1996 850 T5 ex-police expecting it to have been serviced regular as clockwork, thus being well maintained and in good condition. But since i got the car it has had a terrible hot start problem and now has a ticking noise. Local garage has ruled out cambelt,waterpump, tensioners/rollers,power steering and alternator faults. He did comment on several rocker bolts that are not standard so advised me to do a compression check, my tester isnt accurate but is consistent and here is what I found

1)9.3bar 2)6.6bar 3)6.6bar 4)9bar 5)8bar So I presume from this that I have either a head fault or headgasket fault between 2 and 3. But before I replace the headgasket and test the head/skim I would rather find out what this noise is(dont want to waste money) Volvo says that it is a bent conrod(but tried to sell me an engine privately) Local garage says it is a hydraulic tappet(but he is a BMW specialist). I says I?m not sure. The noise is apparent at tickover but gets worse but it isnt consistent with the revs. I noticed that at a steady 2000rpm,no matter what gear, the noise was intermittent but it was speeding up and slowing down even though the rpm was steady. Can somebody help me please? Many Thanks Dale
Reply to
pecky2k
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Fraid this kind of fault is very difficult to diagnose without seeing and hearing the car, however you elabourate alittle more- how does the car run, does it misfire, does it start from cold ok on all cylinders, how is the mpg, is the noise roughly at half engine speed or what???

As many details as possible please.

When you say its hard to start from hot, is it suffering from no fuel, too much fuel, no speak what??

Tim..

Reply to
Tim (Remove NOSPAM.

Bent conrods is a common fault on engines having run at higher boost than original, above 1.1-1.3 bar. Bent conrods might result in bad compression. You can test that if you can measure how high up the pistons go on all cylinders.

Niels

Reply to
Niels Bengaard

Since posting I have taken the rocker cover off and noticed that some of the holes have been sealed by an expert in kitchen sink sealing. In reply to questions regarding the engine:- > how does the car run, > does it misfire, does it start from cold ok on all cylinders, how is > the > mpg, is the noise roughly at half engine speed or what??? > > As many details as possible please. > Number 2 plug was black but not oily. Starts fine from cold. The noise is intermittent throughout the rev range, but more apparent under load. I havent noticed a misfire and its the first Volvo that I have owned(was a BMW man) so I?m not sure what kind of niggles to look for really. MPG?? If taken easy then its not too bad, actually its better than expected, but with all that power on tap and owning a very heavy right foot I couldnt say for sure. I have put 48 litres in and done around

150 miles but quite a bit of that has been on tickover at the garage > Bent conrods might result in bad compression. You can test that if you > can > measure how high up the pistons go on all cylinders. > How can you measure the stroke accurately without taking the head off?

Cheers Dale

Reply to
pecky2k

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