01-27-2016, 02:09 PM
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#15
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Veteran Member
Join Date: Mar 2005
Location: Sand Springs, OK
Posts: 8,132
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Re: Lapping piston rings
Quote:
Originally Posted by Bob Mulry
Hi,
I worked at a Cadillac Dealership and had to work on the HT4100 engines. The tune up guys would send the cars to heavy duty to have the trans diagnosed for no full throttle upshift. We would run a can of TEC through the engine to remove the varnish from the valve stems to prevent them from sticking. Re-road test and the trans was fixed.
The varnish caused the engine RPM to flatten out and not reach the RPM needed by the governor to do a full throttle upshift.
We pulled out a lot hair on that one.
Bob
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Interesting!
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Ed Wright 4156 SS/JA
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