|Subject:||RE: Hummer||Date:||Sat Sep 12 12:21:22 2015|
THE ONLY NUMBERS OF IMPORTANCE ARE ON THE ENGINE CASES.
LEFT SIDE, UP FRONT NEAR THE ENGINE MOUNTING HOLES YOU WILL FIND THE NUMBERS BOSS. IF IT IS A 49, IT WILL READ
49S (THE MODEL)AND 4 NUMBERS FOLLOWING THAT ARE PRODUCTION
NUMBERS. LOOK AT THE CASE HALVES AT THE BOTTOM WHERE THEY JOIN. ASSEMBLY/MACHINING NUMBERS THERE SHOULD MATCH.
CYLINDER BORE,S MODEL STANDARD WAS 2.O625
REPRODUCTION PISTONS ARE AVAILABLE UP TO .060 OVERSIZE.
HOWEVER---THE STANDARD "S" MODEL PISTONS HAD A .500 IN WRIST PIN AND REPRODUCTION PISTONS HAVE A 9/16 PIN.
THAT SAID, YOU HAVE ROD/PISTON/OVERBORED CYLINDER
PROBLEMS ALREADY FOR WHICH THERE ARE SOLUTIONS.
THE FRAME/FORK NUMBERS YOU QUOTE ARE CASTING NUMBERS AND INDICATE YOU HAVE A LATER MODEL FRAME.
E-MAIL IF YOU HAVE OTHER QUESTIONS AND I WILL TRY TO FIND TIME TO ANSWER. BEAR IN MIND, MY 86 YR OLD MODEL BRAIN
HAS BEEN SUBJECTED TO TRILLIONS OF NEUTRINO PENETRATIONS AND
MAY TURN OUT RUSTY ANSWERS.
PS. DO YOURSELF AND YOUR VENDORS A GREAT FAVOR AND GET BOTH A PARTS AND SERVICE MANUAL EARLY ON. THESE ANSWER
A LOT OF QUESTIONS AND PREVENT MANY PROBLEMS.
----- ORIGINAL MESSAGE FOLLOWS -----
I recently picked up a 1949 Hummer basket case that I'm looking to restore. My research tells me the cylinder bore on this motor is 2.125 but it measures at 2.105. Huh?
We've honed the cylinder out to 2.120 to clean up a groove left by a ring sticking out of the piston, but I can't seem to find out what the actual standard piston size is? .010 - .070 over,(over what?)
I've tried contacting the 2 places that i've found that sell hummer pistons but neither answer the phone or return messages. Any help on this would be greatly appreciated!
I also can't identify the year of the frame. The fork and frame part numbers are 45692-53 and 47454-53. The only info I found is that these are simply part numbers?