Lapping piston rings

[Ed Wright]

I made the mistake of using that stuff ONE time inside my shop. And, the tail pipes turned down. Black spots on the floor, and could hardly see. That is an outside operation, imho. :-)

[Pvt Parts]

Originally Posted by Ed Wright

I made the mistake of using that stuff ONE time inside my shop. And, the tail pipes turned down. Black spots on the floor, and could hardly see. That is an outside operation, imho. :-)

We always had the rear end just outside the bay door when we used it. Some guys claimed that ATF worked just well but I never used it.

[Dwight Southerland]

In my early days of turning wrenches I worked with an old(er) drag racer who used ATF down the carb to eliminate carbon knock. It always seemed to do the trick, but it had the same characteristics as you related about TEC. We had the local fire department show up once . . .

[Rich Biebel]

Onan made a product to carbon clean engines. 4C cleaner, and you sprayed it in the carb of a running engine. Similar smell as the GM cleaner and some other products you could buy. Bluish white smoke poured out the engine. It did help but definitely not as effective as removing the heads and carbon cleaning the engine.

An Older Onan flathead engine can literally stop turning over from the carbon buidup. Took a machine out of a support vehicle at the World Trade Center site after 9/11 that did.
We put in a new generator but the old one was just locked up from carbon on top of the pistons.....No time to waste there....

The stuff was easily the best carb cleaner as it dissolved pretty much anything in carb passages.

None of these products are still available and I tried to hunt down a case of 4C a while ago.....None available and no longer made.

Tried a lot of other chemicals....Mopar made a carbon cleaner too but I don't think they sell it anymore either....

SeaFoam works but nowhere near as well.....

[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

[Ed Wright]

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

Interesting!

[Rich Biebel]

I can definitely identify with the difficult diagnosis issues from my days as a dealer mechanic.......Mid 1970's Pontiac-Jeep-Subaru line mechanic....flat rater

GM was producing some really poor stuff and the Jeeps and Subarus new to this country had more than their share of problems....