Printable View
After hearing the original sound file on the opening post, it reminded me of a death rattle in the bottom end on my old 2L Escort. Diagnosis on that: stuffed big end bearings. Very familiar sound.
I'd be very suprised if it is valve train related, even including the cam. That noise is related to the things swinging off the crank without a doubt.
Thank you guys! I will get a set of conrod bearings and replace them. I tried to check a play by hand, they were perfectly solid, but when the engine heats up it can be a different story... We are talking here about 50-100um movement which can be impossible to feel by hand (taking into account having oil in the bearings), I agree with you. I will give it a try.
Right now I am getting more worried about the wear on the camshaft lobes and lifters and the stretched timing chain. Even if the bearings solve the rattling problem, I feel that the cam problem will only become worse. Should I replace the cam now???
I also read about the premature cam wear problem, which is caused by a low zinc content in the oils. That is the reason I use HPR10 now which has 1100 ppm. This article very well explains the problem MOTOR Magazine Article | MOTOR Information Systems and even suggests to use a zinc additive to get the zinc levels higher; I think that 1200ppm is specified as minimum by LR.
Might be worth trying some plastigauge to see just what the clearances are on the bearings.
Come on Jiri.......Tell where your up to on this one. Have you found the cause of the noise yet???
Hi there, ordered new conrod bearings and waiting for them... Will give you an update once I get my hands dirty :-)Quote:
Originally Posted by davrac
Jiri have you fixed that engine yet?