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Post by Deleted on Aug 14, 2014 21:34:28 GMT 1
Why are you doing a compression test when in the first line of the first post to mention that the valve clearances need adjusting. It's still missing slightly at idle speeds. I want to check the compressions before forking out on injectors. Clearances have been done.
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Post by Deleted on Aug 14, 2014 21:36:36 GMT 1
Has it ever had any work on the valve and pump timing ? has the pump ever been moved and not clocked with a dti ? Never been touched. I've always replaced the cambelt and locked it up in position double checking afterwards.
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Post by Deleted on Aug 14, 2014 21:38:33 GMT 1
you answered your own question..... its a turbo driven air intake... the turbo is driven by the exhaust gases yeah.....it blows the air drawn in from the air filter into the cylinders via the inlet manifold if the valves are shut, where does that blown air go? again do a compression test, it will tell you how good the pistons/ rings and valves are sealing... engine fundamentals.....! I can't see how it would blow out the inlet manifold when the inlet valves should be shut
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Post by Deleted on Aug 14, 2014 21:59:35 GMT 1
Guess I'm just thinking out loud really. I will comp test it. I'm just thinking it could be a duff inlet valve and not a bad injector
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Post by wheelnut on Aug 15, 2014 0:08:01 GMT 1
the turbo is driven by the exhaust gases yeah.....it blows the air drawn in from the air filter into the cylinders via the inlet manifold if the valves are shut, where does that blown air go? Not sure about this... Diesel engine valves do not remain shut when the pedal is released. They continue to open and close.
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Post by upkeep on Aug 15, 2014 8:14:12 GMT 1
Cylinder leakage test would be good
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Post by chippie on Aug 15, 2014 8:22:48 GMT 1
you answered your own question..... its a turbo driven air intake... the turbo is driven by the exhaust gases yeah.....it blows the air drawn in from the air filter into the cylinders via the inlet manifold if the valves are shut, where does that blown air go? again do a compression test, it will tell you how good the pistons/ rings and valves are sealing... engine fundamentals.....! I can't see how it would blow out the inlet manifold when the inlet valves should be shut ahhh, point conceeded, I re read the post about the high vac on idle, then when revved up, theres blowback into the manifold.....
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Post by Deleted on Aug 15, 2014 15:23:24 GMT 1
Funnily enough I thought it sounded like a blowing exhaust. Up in the country lanes around Brecon coming down a steep hill I can hear it, windows down in the hot weather and I've been puzzling where my blo*dy exhaust is blowing from. It's coming from the induction side of it. Not that loud but I noticed it Well I'll comp test it, see what that comes up with as it's a free test. Leak down would be best though I agree. Car still goes great though that's what's bugging me and the amount of new diesels I've been behind today chucking blue out is unbelievable lol
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Post by Deleted on Aug 15, 2014 16:03:53 GMT 1
Has it ever had any work on the valve and pump timing ? has the pump ever been moved and not clocked with a dti ? Never been touched. I've always replaced the cambelt and locked it up in position double checking afterwards. ok, have you checked for cam lobe wear, particularly exhaust ?
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Post by Anna Rack on Aug 15, 2014 17:40:11 GMT 1
That does sound like a valve insn't opening properly. Saw it on an old OHV diesel once where one of the rockers had worn down.
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Post by Deleted on Aug 17, 2014 16:37:02 GMT 1
Never been touched. I've always replaced the cambelt and locked it up in position double checking afterwards. ok, have you checked for cam lobe wear, particularly exhaust ? They looked ok while shimming it so didn't measure but that's another thing to check Thinking about it now the valve clearances would have been miles out and I would have picked it up?
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Post by Deleted on Aug 17, 2014 16:41:29 GMT 1
That does sound like a valve insn't opening properly. Saw it on an old OHV diesel once where one of the rockers had worn down. I'm thinking there is a dodgy valve there. Luckily I wrote all the clearances down in the Haynes last time I looked at it a few years ago and the gaps haven't changed all that much to show a problem with a bent valve or something. Maybe a burnt valve or seats. Compression test next. Might try running it with the inlet manifold off like I saw on Youtube earlier. Should see the gasses coming out if they are that bad.
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Post by Deleted on Aug 17, 2014 20:09:58 GMT 1
an inlet valve that bad !
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Post by Deleted on Aug 20, 2014 17:19:50 GMT 1
Right did a quick compression test this morning, just wanted to check the tester and fittings really. Cold 420, 410, 420, 410 this was for about 4 compression strokes each. Then I did about 10 compression strokes each cylinder 490,470,480,480. First compression stroke was just over 100psi for each cylinder Thought it would have been a bit higher? I'll do it again on the weekend. The starter didn't seem to spin as fast as I thought it would with no glow plugs in it Then again I never normally have to crank it over for more than 2 secs. Pretty even numbers and nothing seems drastically wrong I've got a pic of the air cleaner in it as well which I'll put up later. It is a bit distorted
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Post by Rhubarb on Aug 20, 2014 17:31:46 GMT 1
Those figures are fine...Just drive the thing
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