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04-22-2012, 03:37 PM | #1 |
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Hope you can help
Hey guys, help,
Awhile back, I was griping about a noisy valve and not being able to locate any clearance problems. I've messed around with all the valves and really had the clearances tight and still same click at same volumn. Before I start pulling the head and pan, has anyone heard a broken ring sound like a valve?? I've had my sthethascope all over the engine/water pump etc. and sounds like #1 or #2 but it Runs great. I have NOT done a compression check though. No threads really hit on the possiblity of broken ring noise...I checked. Thanks! Pete |
04-22-2012, 03:51 PM | #2 |
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Re: Hope you can help
Let us know how the compression checks out.
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04-22-2012, 06:44 PM | #3 |
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Re: Hope you can help
Seems like a valve train noise would be a slow click (half the r.p.m.'s), where a piston related noise would be fast, matching the actual engine revelutions. What does a boogered up cam gear sound like? Messed up teeth would be at the front of the engine like your noise and could be at half speed.
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04-22-2012, 07:01 PM | #4 |
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Re: Hope you can help
How about if you rotate the suspected piston/cyl to the bottom and look thru the spark plug hole to look for abnormal wear/gouging on the cyl wall or a compression ck. How about a cracked spring that applies pressure to the front of the cam??
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04-22-2012, 07:31 PM | #5 |
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Re: Hope you can help
PeterJ,
I've had good success LOCALIZING noises with a cheap stethascope without the probe, just use the open hose. With the probe, sometimes the sounds transmit & are hard to localize. Used that way, you can also find & locate vacuum leaks in a jiffy! It'll scream like a BANSHEE! Bill W.
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04-22-2012, 07:56 PM | #6 |
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Re: Hope you can help
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04-22-2012, 08:37 PM | #7 |
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Re: Hope you can help
In high school I had a 54 Chevy with worn ring lands and broken rings on one piston. It didn't make a sound, but I could feel the loss of power on one cylinder.
If you have a cam gear with an aluminum center check there for noise and loosness. BTW, I knew they were broken rings because I removed that piston and changed the rings. Three days later I learned that I should have changed the piston at the same time, because the new rings broke again. Last edited by Tom Wesenberg; 04-23-2012 at 12:29 AM. |
04-22-2012, 10:27 PM | #8 |
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Re: Hope you can help
Let's see. Used the stethascope(sp) an it definately #'s 1 or 2. Fiber cam gear and no noise in that area. Fanbelt off and still clicks. I've got about 40 miles on since installation. Stock B engine, new valves/guides and rings. Like I mentioned I'm at my wits end and need to know if a broken ring could do it. I think all other variables have been explored. Valve cover has been off 5 times looking for this sucker!
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04-23-2012, 12:09 AM | #9 |
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Re: Hope you can help
I run a B engine with a click like a valve clearance proble--middle of the engine. I'm convinced it's too much clearance on the center cam bearing. Engine runs great, clicking almost goes away after the engine gets good and warm.
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04-23-2012, 12:25 AM | #10 |
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Re: Hope you can help
Are you running the "B" fuel pump? (might be a suspect)
If it were mine, I might add 1/2 to maybe 1 bottle of STP to see if the viscosity change might affect the noise. No, I'm NOT a proponent of additives! I might also just drive it lovingly and see what develops. Bill W.
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04-23-2012, 12:32 AM | #11 |
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Re: Hope you can help
Have you tried shorting the plugs for #1 and #2 to see if the noise changed?
It's better to short the plugs rather than pull the leads away, as the coil can short when the spark isn't sent to ground. Last edited by Tom Wesenberg; 04-23-2012 at 05:23 AM. |
04-23-2012, 01:05 AM | #12 |
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Re: Hope you can help
I've shorted the plugs at different speeds. Both have a good rpm drop. The noise seems to get louder when warm. I did think I noticed the noise getting a little erattic today when I got up around 40 but can't be sure. I've also dosed the gas with liberal amounts of MMO. #1 cylinder did have some scoring when I put it together but didn't go all the way up and I honed it down pretty well.
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04-23-2012, 07:34 AM | #13 |
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Re: Hope you can help
This one started out sounding like a valve clicking. You could be on to something. This one ended having more brass in it than cast iron,LOL.
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04-23-2012, 07:39 AM | #14 |
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Re: Hope you can help
Try that last one again.
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04-23-2012, 08:01 AM | #15 |
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Re: Hope you can help
Peter, any chance it might be a loose valve seat? We had one like that on Dad's 30 P/U, chased a click for a day, then pulled the head. Every thing looked OK so I spun it over, then No. 2 Ex. Popped up wearing the seat insert. then it fell back to the block and we had our noise.
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04-23-2012, 09:38 AM | #16 | |
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Re: Hope you can help
Quote:
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04-23-2012, 10:33 AM | #17 |
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Re: Hope you can help
I didn't check any clearance except the rings. It definately sounds metallic. No valve inserts so that's not it. James, that's ugly! Ive tried to check out the bore through the spark plug hole but couldn't get enough light down there. I'm going to test compression today. Hopefully I'll get a drop. I'll report back on my findings. I'm real uncomfortable with the "drive it until it breaks" theory.
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04-23-2012, 10:34 AM | #18 |
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Re: Hope you can help
James, with the snap ring still in place, how do you explain all that damage on that end of the piston?
Did a broken end of the other snap ring travel through the hollow wrist pin and get jammed in that end? |
04-23-2012, 10:37 AM | #19 | |
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Re: Hope you can help
Quote:
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04-23-2012, 10:54 AM | #20 |
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Re: Hope you can help
Mine has a tick that comes from the oil pump, still works fine and someday I will tear it apart and rebuild it.
Mike
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04-23-2012, 01:03 PM | #21 |
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Ya know Tom, I really don't know. I was puzzled by that very thing when I took the engine apart and the keepers were still in their holes.The one in the first picture was just like that and showed wear on the part that stuck out. The one in the second picture was worn like it had been sliding up and down the cylinder wall but had tension and was still in the groove. I don't think the pin ever touched the cylinder wall just the clips. I also had an engine come in that had inserts on the mains using MG or some bearings like that and the rods had inserts in the caps with babbitt in the rods, talk about shadetree. If you work on these long enough you will see some crazy stuff.
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04-23-2012, 01:22 PM | #22 | |
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Re: Hope you can help
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Last edited by George Miller; 04-23-2012 at 05:12 PM. |
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04-23-2012, 04:55 PM | #23 |
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Re: Hope you can help
I wonder if the damage wasn't done during installation of the new pistons and rings when an oil ring slipped out of the ring compressor before it entered the top of the cylinder?
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04-23-2012, 10:09 PM | #24 |
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Re: Hope you can help
No George I did not. Funny thing was when we test ran it for about a minute, I wasn't making any noise. I still need to do a compression check which seems to be the only logical step. I don't know if a busted ring would show a drop though.
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04-25-2012, 10:06 AM | #25 |
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Re: Hope you can help
Thanks Guys,
I remembered that the definition of crazy is doing the same thing over and over and expecting different results. I'm just going to pull the head and look. I would have to do it anyway (wife is thrilled). I'll pass on my findings. Thanks, Pete |
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