Problem with getting a rebuilt 1550 gas motor started

[Taw128]

I am restoring a Oliver 77 tractor and bought a rebuilt oliver 1550 gas motor. I got the motor install on the tractor, flywheel is lined up at top dead center and the firing order is correct. After turning it over the spark plugs are still dry even when choking it. I took the air filter and hose off the end of the carburetor and when turning it over air backfires out of the carburetor. I don't know if this is a timing issue or not.

 

[Anonymous-0]

Yes ,but check the valve ajustment first.On a gas it would be easy to check compression too.

 

[greg krush]

if it is backfiring out of the carb it is a timing issue, either spark timing or valve timing, most likely spark timing, are you sure the disttubutor is in corectly, can easily be 180 degrees off. do you get good suction if you put your hand over the carb intake, if not it is most likely the cam drive gear is installed wrong.

 

[Taw129]

When I purchased the motor at first I thought it was a Oliver 77 gas motor but when I went to put on the flywheel I realized the crankshaft did not have any dowels on it is possible that the flywheel is in the wrong position?

 

[Anonymous-0]

I know on the international's the bolt pattern on the crank is such that you can only put the flywheel on one way. Maybe oliver is the same way?

 

[Anonymous-0]

Yes it can the quick check is to put the pointer on the TDC mark and the keyway in the front pully should be pointing straight up.

 

[OLarry from MD]

Yes ,but after all the years the flywheels are often reemed out by someone who puts them on wrong.