Bearing question
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Posting Guru
Joined: Feb 2007
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From: Pittsburgh,Pa.
Bearing question
Are there any racing engine builders here? A former coworker told me that it is common practice to use some type of adhesive on the back side of connecting rod bearings in racing engines to prevent them from spinning in the bore.This does not make sense to me as the thickness of the adhesive would distort the insert and diminish the clearance.I've rebuilt many engines , most of which were over the road diesels that don't operate anywhere near the rpm range of an engine used in something like a sprint car.I'm just curious to see if this true or the guy was attempting to utilize my hindquarters for a chimney.Thanks in advance.
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Joined: Sep 2005
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From: Kiefer, Northeastern Okla
All I can say is, don't bend over in front of this guy.
NEVER EVER put ANYTHING on the back side of the bearings.
I've actually torn one down where a kid put loctite on there. And that's exactly what happened. They locked tight alright.
That's why bearing crush is designed into the bearing itself- to keep it from spinning.
Pete
NEVER EVER put ANYTHING on the back side of the bearings.
I've actually torn one down where a kid put loctite on there. And that's exactly what happened. They locked tight alright.
That's why bearing crush is designed into the bearing itself- to keep it from spinning.
Pete
Laughing Gas
Joined: Nov 2002
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From: Fairmont
I have never heard of such a practice.
The correct housing size for the main & rod bearings gives the proper crush on the bearing. This is what prevents the bearings from moving. In the case of aluminum rods, they have provisions for dowels and the bearings also.
The correct housing size for the main & rod bearings gives the proper crush on the bearing. This is what prevents the bearings from moving. In the case of aluminum rods, they have provisions for dowels and the bearings also.
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Posting Guru
Joined: Feb 2007
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From: Pittsburgh,Pa.
Thanks for the info.As I said I'm a diesel builder.The idea didn't begin to make sense but then again I just didn't know. If someone attempted to run a 3406 Caterpillar or an 855 Cummins at 7000 rpm they would in effect be creating a large cast iron bomb.Thanks again.
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Joined: Sep 2001
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BOGUS!!! Stay away from that guy...
The bearings also have tabs on the ends that fit into slots in the rods that keep the bearings from spinning along with the "crush". No adhesive will hold under the high heat (red hot) conditions that cause bearings to spin.
The bearings also have tabs on the ends that fit into slots in the rods that keep the bearings from spinning along with the "crush". No adhesive will hold under the high heat (red hot) conditions that cause bearings to spin.
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Joined: Apr 2004
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I was going to stay out of this disscusion because the guys answered the question of keeping the bearing from spinning. The one thing that comes to my mind is heat transfer, put anything between the bearing shell and the rod and you lose the ability of the bearing to lose its heat. The rod acts as a heat sink and because it is flying around in oil carries away a lot of it. Just my 2 cents.
Kotzy
Kotzy
