3000m engine noise help required
Discussion
I have a noise coming from the front cover area it's as though the large nylon cog is rubbing on either the inside or outside of the cover. I have stripped it down twice now to see if I can see what's catching but there are no signs . I have replaced the large cog due to a school boy error on my part when I removed the manual pump to fit electric I put the wrong bolt in when fitting the blanking plate and tightened it onto the nylon cog damaging it luckily I had a spare so just fit that. On removing the cog the second time I did notice that it did have a slight chamfer on the inside edge but on checking the old one this was just the same and I didn't hear the noise when that one was fitted having said that I'm not sure if I ran it up to full temperature.
Any help would be great.
Just to note when the engine is cold there is no noise whatsoever it only appears once the engine gets hot.
Chris
Any help would be great.
Just to note when the engine is cold there is no noise whatsoever it only appears once the engine gets hot.
Chris
So only when the oil gets thin?? If it was rubbing you would have found it? Sounds like gear mesh noise. Are the gears off different engines or the wrong way round. Ie not a matched set or run in together? If in doubt cut the oil filter open and inspect for metal etc. can tell you a lot. Good luck richard.
Thanks for the replies
The noise is just as you would expect it to sound if the timing gear was rubbing against the cover as the the engine gets warmer the noise gets louder. If you put a mechanics stethoscope to the cover you definatley hear its coming from inside the cover and mainly t the top where the timing gear is.
But when I remove the cover and cog there is no sign of pick up anywhere so has me baffled.
Chris
Edit to say that everything is exactly where it should be and timing is fine the engine runs sweet with a nice steady idle and quick pick up in neutral not run it on the road yet.
The noise is just as you would expect it to sound if the timing gear was rubbing against the cover as the the engine gets warmer the noise gets louder. If you put a mechanics stethoscope to the cover you definatley hear its coming from inside the cover and mainly t the top where the timing gear is.
But when I remove the cover and cog there is no sign of pick up anywhere so has me baffled.
Chris
Edit to say that everything is exactly where it should be and timing is fine the engine runs sweet with a nice steady idle and quick pick up in neutral not run it on the road yet.
Edited by chris52 on Sunday 15th September 20:23
griff 200 said:
Is a steel gear not the way to go to prevent failure??
exactly, you reminded me, txs !but back to the noise, bit mysterious this one, must say...
Surely would check and recheck all if nothing is wrong. If you had it stetescoped, there is other stuff that could be wrong, seals and even bearings.
Why don't you give Adrian a call ?
Frank
Change the oil to proper oil not modern weight! If the noise changes its more likely to be gear contact? But welcome to my world of enginerring! I've got a 400hp engine that's keeps having the twin exhaust valves touching the number 5 piston? Changed the piston ' valves springs etc. was ok for 50 hours then started again ? Just skimed 5 thou off the piston and cut the valves in the head but on a £100'000 machine I'm pushing my luck. Running ok at the moment,keeping my finger crossed. You could try and ring the engine builder at burtons he is a good guy. Richard
After speaking to an Essex engine builder he suggested that it could possibly be the backlash on the gears and advised me to use the lower gear from the engine I took the fibre gear from. I have now done this and the engine seems a lot quieter but I have not run it up to full temperature yet as it was getting a little late and didn't want to upset the neighbours. This time while in there I checked to make sure that it wasn't catching the cover or the back-plate.
So hopefully fingers crossed its now sorted but wont find out till the weekend when I can run it up to full temperature. With a bit of luck it should be somewhere near finished this weekend bar the geometry tuning and getting the new paint flatted buffed and polished. Will post pictures on my restoration thread when done.
Thanks for the help again
Chris
So hopefully fingers crossed its now sorted but wont find out till the weekend when I can run it up to full temperature. With a bit of luck it should be somewhere near finished this weekend bar the geometry tuning and getting the new paint flatted buffed and polished. Will post pictures on my restoration thread when done.
Thanks for the help again
Chris
Slow M said:
griff 200 said:
. . . engine . . . keeps having the twin exhaust valves touching the number 5 piston? Changed the piston ' valves springs etc. was ok for 50 hours then started again ? . . .
Rod stretch? Best,
B.
I'd very carefully check the camshaft timing on that cylinder and also the piston to valve clearance, which should be at least 0.100"
Fred
All good points but blip the throttel and it may stop for a fue mins then come back so it's very odd. The valve lay out is that the two valves are opened by one pushrod by a floating bridge. So if one valve spring was weak it would open more and close slower. But skimming the piston and recutting the valves deeper have fixed it. But still waiting for the German manufacture to advise me. All piston clearence etc is bang on I have had head skimmed but it was fine for 50 hr after that. All good fun!!!!
Well the noise is still there. I have had the front cover off 3 times now and no visible evidence of where the noise is coming from. The noise is like a dry bearing it only appears when the engine is warm/hot it is defiantly coming from the front timing cover area and is still there when the fan belt is removed. The noise can be heard while in the car with the engine running on idle after that the noise of the engine drowns it out. The oil pressure is excellent I have removed the petrol plump plate and oil is circulating around the gears. I am now completely baffled by this noise and have no idea what to try next. Any suggestions would be really helpful
Chris
Chris
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