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07-17-2015, 08:45 AM | #1 |
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engine knock question
Just curious, at what clearances do rod and main bearings start to knock?
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07-17-2015, 11:16 AM | #2 |
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Re: engine knock question
I've seen [heard] them knock at .003" on other engines. These model A engines seem to be able to handle a little more before they get noisy.
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07-17-2015, 05:03 PM | #3 |
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Re: engine knock question
Depends on oil viscosity, too. And oil temperature.
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07-17-2015, 05:11 PM | #4 |
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Re: engine knock question
They put up a pretty good knock when the Babbitt in a rod decides to fall to the bottom of the pan in little bitty pieces.
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07-17-2015, 05:28 PM | #5 |
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Re: engine knock question
RE; 29 Business Coupe -my engine was rebuilt before I bought the project , when I finally got it together and running it had a knock, determined it sounded like it was # 2 cylinder. I pulled the pan rolled the engine over and was able to see the rod was tight against the piston Boss , just had to pull that piston and had the boss machined for clearance , good as new now. might not be your problem , just sharing my results
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07-17-2015, 08:36 PM | #6 | |
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Re: engine knock question
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Quote:
most likely this means the rod is bent, and that the piston is cocked in the cylinder |
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07-17-2015, 08:42 PM | #7 |
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Re: engine knock question
Hi Kurt,
What would cause tods to bend? Regards Chris Cape Town |
07-17-2015, 09:43 PM | #8 | |
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Re: engine knock question
Quote:
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07-17-2015, 09:43 PM | #9 |
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Re: engine knock question
I've heard tell uf a "ROD BENDIN' GREMLIN"!--Sum times, he fills one cylinder clean full uf WATER & WHAMO!
Bill W.
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07-18-2015, 08:48 AM | #10 |
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Re: engine knock question
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07-18-2015, 10:28 AM | #11 |
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Re: engine knock question
Rod NOT Bent , machinist inspected , aftermarket piston problem
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