Joined
·
660 Posts
Right folks...
Headed into my mechanic today (Mathew as always top guy, really helpful) to get an oil, plugs and air filter change, and also took the chance to check on some annoying noise coming, seems, from the left (far-side) engine bank/side. It sounds clearly as a rotating noise. This is coupled with relatively low engine pressure at service temp on idling; 2 weeks ago @ Joe Macari's service day we hooked-up the SD2 and it was reading 1.7 to 2 bar, which made me a bit concerned.
We (both Mathew and myself) looked around with a stethoscope... no noise coming from the timing chains, no weird noise from the tappets, none from the top of the engine block. The engine, however, has a loud knocking-like noise. Fuel injectors were a bit louder than usual, but that noise was defo not coming from there. BTW saw a 4200 engine dismantled to note the timing chain guidelines/tensioners had snapped... which, seems, is a nasty habit in some late example cars, esp. Gransports. That's why that area of the engine was inspected first, to check if it was one of the chains knocking. But nope.
I'm heading-in next Saturday with more time for a thorough test to find the sucker, but welcome any ideas/suggestions. Interestingly, the oil pressure seems to have gone slightly better after the oil change (used Silkolene Pro S 5W-40) but it's not good enough. I'm guessing it could be the oil pump, but oil pressure goes up to 5 bar immediately with the pedal on the gas, so the car runs well. I must say very well. No problems with acceleration, or response. But that noise...
BTW looking at the oil coming out it showed no nastiness (metal residues, etc.); it looked very clean I must say.
As a sideline, when starting from cold (say, in the morning) you can hear like a metal sheet sligtly knocking, again, from the far-side, noise that dissapears once the engine gets warm. We had a quick look at the steering rack on the lift, but again, it is a rotational noise.
If anyone has an idea/suggestion/faced this, please drop a comment.
Cheers,
Ed
Headed into my mechanic today (Mathew as always top guy, really helpful) to get an oil, plugs and air filter change, and also took the chance to check on some annoying noise coming, seems, from the left (far-side) engine bank/side. It sounds clearly as a rotating noise. This is coupled with relatively low engine pressure at service temp on idling; 2 weeks ago @ Joe Macari's service day we hooked-up the SD2 and it was reading 1.7 to 2 bar, which made me a bit concerned.
We (both Mathew and myself) looked around with a stethoscope... no noise coming from the timing chains, no weird noise from the tappets, none from the top of the engine block. The engine, however, has a loud knocking-like noise. Fuel injectors were a bit louder than usual, but that noise was defo not coming from there. BTW saw a 4200 engine dismantled to note the timing chain guidelines/tensioners had snapped... which, seems, is a nasty habit in some late example cars, esp. Gransports. That's why that area of the engine was inspected first, to check if it was one of the chains knocking. But nope.
I'm heading-in next Saturday with more time for a thorough test to find the sucker, but welcome any ideas/suggestions. Interestingly, the oil pressure seems to have gone slightly better after the oil change (used Silkolene Pro S 5W-40) but it's not good enough. I'm guessing it could be the oil pump, but oil pressure goes up to 5 bar immediately with the pedal on the gas, so the car runs well. I must say very well. No problems with acceleration, or response. But that noise...
BTW looking at the oil coming out it showed no nastiness (metal residues, etc.); it looked very clean I must say.
As a sideline, when starting from cold (say, in the morning) you can hear like a metal sheet sligtly knocking, again, from the far-side, noise that dissapears once the engine gets warm. We had a quick look at the steering rack on the lift, but again, it is a rotational noise.
If anyone has an idea/suggestion/faced this, please drop a comment.
Cheers,
Ed