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Grease Monkey
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Dear all! Will anyone have an answer to a clicking sound in my engine when running idle. When driving no sound and runs very well. Toptuned valves,new lifters and no leaks. Fuel pump arm revised. Oilpress 5 to 14. Th clicking has always been and only in idle. All answers most welcome! Thanks in advance!
Michael kiersgaard , Denmark
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Timing gear, water pump, generator, remove fan belt an see of it helps.
Gene Schneider
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It also could be a valve push rod slightly bent and/or the side cover of the engine bolted down too tightly and getting too close to the push rods. If you loosen the two acorn nuts on the side cover while it's running and the sound changes, that might confirm it.
Good luck with it.
All the Best, Chip
"It's wise to choose a SIX"
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Grease Monkey
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Thank you Chip! I will try this as I have not had my mind there!! But really it sounds like coming from just behind ,to the back , of the oilpump but when running the engine at idle and holding on with a stick to the lifters with the cover off the sound do not change so I doubt it can be the lifters ....but the idea of the cover may touch I will try tomorrow!! But engine running really nice - 92 years old and newer restored !!! We just went for a 100 miles trip and what a pleasure!! Strange if no other Chevy 1931 owners do not recall this clicking ...even it is not what I would call a serious bad sound I feel sure that it was not build into a Chevrolet on purpose! Thanks for the thoughts!
Michael
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Grease Monkey
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Hello chew nut!
Thanks for the input ...but the noise/sound seems to come from aft of the oil/distributer unit ...and could be something with the timing wheels ... I hope not as we then are into the camshaft. Anyway the engine spins nicely when at work!!
Thanks for your thoughts!
Michael juni in
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Possible wrist pin noise. The one I had always seemed loudest at idle.
Dick
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Grease Monkey
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Thank you Dick!
What is exactly the wrist pin and where do I find it ..sorry for my ignorance but danish is a bit different ...however I guess it is the shaft of the oilpump and the distributer for the sparkplugs. If it is , it corresponds to what I think I can hear with a stetoscope - so called big screwdriver .. around that part. If you have a specifik solution to this it will be welcome!!
Thanks a lot!
Michael
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A wrist pin is the device that connects the piston to the connecting rod. https://www.howacarworks.com/images/142/undefined_w1400.jpg
VCCA Member 43216
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1938 HB Business Coupe
1953 210 Sedan
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Shade Tree Mechanic
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I would try to remove sparkplugcables one by one, and check if it`s related to a certain cylinder/piston/connecting rod.
If clicking sound change/dissappear you know where to concentrade your search.
PS. nice to see another Dane on here, you are in the best place to get help with your 1931.
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Grease Monkey
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Hello Morten!
Thanks for your welcome! Maybe the cars will meet some day ... Pulling off the spark one by one has been tried and make no difference with the sound ... Seems a little tricky with out taking the whole thing apart ..
Thanks to Dick .. You may be right with the wrist pin... But I hope not..
Michael
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The only way I know to check the wrist pins is to remove the pan and check for scoring on the cylinder walls.
Steve D
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Just a guess but my experience that a bent pushrod that's tapping on the side cover will have a tinny hollow type of noise. I'm a proponent of KISS (keep it simple stupid), look at the simple stuff first. To me the description is an out of adjustment lifter. Easy to check and rectify if that's the problem. A bent pushrod could still be the issue since it might flex enough to make the ticking sound but not bent enough to strike the side cover.
Last edited by Tiny; 02/04/23 10:42 AM.
VCCA Member 43216
Save a life, adopt a senior shelter pet.
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Buy a mechanics stethoscope with a long probe so you can better isolate the location of the noise.
Rusty
VCCA #44680
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Grease Monkey
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Thanks to all for all inputs!
Had the rocker cover and side of today but no solution found. All lifters are new an when holding on to them nothing changes ..and it was also clicking with the old set. I think the answer is a wrist pin but will continue with the simple things before going further.
Had a nice drive today ..engine works super and is lively ..and no noise to be heard at speed!
Thanks again for all positive suggestions!!
Michael
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I assume that you removed the pan and checked the rod bearing clearances. A loose rod will click at no-load or light load. Under load the noise will disappear.
Rusty
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hard to answer a question without HEARING it, a guessing game at best... if my 1929 aint tapping it aint running 
AACA - VCCA - Stovebolt - ChevyTalk
Love the Antique Chevrolet's from 1928-1932
The Beauty, Simplicity, History, and the Stories they Tell
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Grease Monkey
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Thank you everybody!! Really worthwhile to have such company!!
I have taken out shims on 5 of the crankshaft bearings .. it did make a difference and I feel sure that I will find the last one still ticking in idle .. but will wait a little.
The car just passed the 8 year inspection we have in Denmark .. and with aplaus! .. so next time it will be a100 year old vehicle going to pass this .. it is not a problem to the car .. but I wonder if I will be the driver!!
Fantastic engineering!!
Thanks to everybody for good inputs !!
Michael
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