Bad timing marks on M-37s??


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Posted by George on Friday, August 24, 2001 at 9:18PM :

I have an M-37 with the timing set at 5 degrees BTDC. It still feels and acts like the spark is late. Gas milage is about 8-9 which seems on the low side. Power seems ok at low speeds, but weak at road speed.

At the Iola miitary show, I spoke with a guy who said that many M-37s have the timing mark in an incorrect position....so setting the timing with a light with reference to that mark will result in incorrect timing.

He said there was information published about this with refererence to M-37B1s. I guess in the form of a service bulletin.

He checked his own timing using a dial indicator, or similar piston stop tool, and found that his timing was indeed off. At top dead center for piston 1, the timing mark for 0 degrees did not match the pointer on the block.

Does anyone have any more information, articles, service bulletins etc about this problem on M-37s (I just read that it happened on M-38s also). How much error might one find...a couple of degrees or much more?

thanks

George



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