This sounds expensive

Oct 10th, 2005, 17:45

Hello,

I have a 2000 V40 T4 (bog standard) which has about 56,000 miles on it and has just started making the most horrendous knocking sound when cold. The knocking increases speed when the revs build and remains for about 2 or 3 minutes until the engine starts heating. The noise gradually gets quieter until it goes completely. It sounds like its coming from between the engine block and the cockpit sort of in the middle of the car (width ways) I have taken it in to my Volvo dealer but unfortunately it was warm when they looked and they didn't hear anything untoward. I wondered whether anyone on here had had a similar problem and could suggest what it might be as I have to wait a week until the garage can take the car back in and I am worried about how expenbsive this is likely to get...

4 forty · Oct 10th, 2005, 19:34

sounds like the hyrdraulic tappets are being starved of oil on initial start up.

paul

pyaap · Oct 10th, 2005, 20:31

Have someone check the exhaust manifold bolts & nuts to make sure they're all still there and have them re-torqued when the engine is cold.

I had one of the bolts undo itself and fall off and Volvo themselves issued a technical report on this as some bolts were inadvertantly left off at the factory itself. Mine rattled a lot when cold but as it got warmer the manifold expands and hence 're-seals' itself.

pyaap · Oct 10th, 2005, 20:59

Forgot to add, here is the TSB number and description:
2250026 MAY 01 Exhaust Manifold - Retaining Nuts Loose, Missing

Oct 10th, 2005, 17:45	#1
AndrewSmith Guest Location:	This sounds expensive Hello, I have a 2000 V40 T4 (bog standard) which has about 56,000 miles on it and has just started making the most horrendous knocking sound when cold. The knocking increases speed when the revs build and remains for about 2 or 3 minutes until the engine starts heating. The noise gradually gets quieter until it goes completely. It sounds like its coming from between the engine block and the cockpit sort of in the middle of the car (width ways) I have taken it in to my Volvo dealer but unfortunately it was warm when they looked and they didn't hear anything untoward. I wondered whether anyone on here had had a similar problem and could suggest what it might be as I have to wait a week until the garage can take the car back in and I am worried about how expenbsive this is likely to get...

Oct 10th, 2005, 19:34	#2
4 forty VOC Member Last Online: Aug 12th, 2015 14:44 Join Date: Dec 2001 Location: sunderland	RE: This sounds expensive sounds like the hyrdraulic tappets are being starved of oil on initial start up. paul

Oct 10th, 2005, 20:31	#3
pyaap Non-T4 T4s RULE!!!! Last Online: Mar 29th, 2017 11:24 Join Date: Nov 2002 Location: Bristol / Bath	RE: This sounds expensive Have someone check the exhaust manifold bolts & nuts to make sure they're all still there and have them re-torqued when the engine is cold. I had one of the bolts undo itself and fall off and Volvo themselves issued a technical report on this as some bolts were inadvertantly left off at the factory itself. Mine rattled a lot when cold but as it got warmer the manifold expands and hence 're-seals' itself.

Oct 10th, 2005, 20:59	#4
pyaap Non-T4 T4s RULE!!!! Last Online: Mar 29th, 2017 11:24 Join Date: Nov 2002 Location: Bristol / Bath	RE: This sounds expensive Forgot to add, here is the TSB number and description: 2250026 MAY 01 Exhaust Manifold - Retaining Nuts Loose, Missing

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