I've got a Case 1816b, with a Tecumseh OH160 engine in it, not 100% wich engine number it has since it got painted over heavily, would like not to pull it out, since everything in that loader is small as heck.
My problem is, that the engine is back firing out of the carburetor and always going high rpm, tuning the carburetor down, doesn't change anything, just that the engine dies off.
First idea was to test the intake valve, but the engine keeps pressure.
So propably it is a timing problem.
The engine got the original SSI ignition unit (#610906), which is triggered by two pins on the flywheel.
Now i see two points that could maybe be done, without pulling the engine. First thing, would be to check if the valves close at propper timing. So open the valve cover, bring the engine to tdc and check that both valves are closed, then bring to bdc and check that exhaust valve opens, back to tdc and check that exhaust closes, intake open, back to bdc, exhaust closes. If this is way out of timing, pull the engine and check that the timing marks on the crankshaft and camshaft match. So that would be pretty easy to accomplish.
If that works out propper, it must be the timing of the ignition, since it should be timed by the two triggerpins, my first thought would be to take the flywheel nut off, then check if the flywheel key is sheared. If that is the case, pull the flywheel and replace the flywheel key. But if that isn't the case, where to look then further?
Try to adjust it, by adjusting the gap between the ssi and flywheel, since it can only be moved up an down, not left/right?
I got the Tecumseh technician manual for the cast iron engines, but interestingly it doesn't cover timing the ignition. What you think. Would be happy it it also would be able to test it, without opening the cylinder head, since a new head gasket is about 140$ to get here in Europe, and cutting one myself from aluminium or copper sheet isn't what I would like to do.
My problem is, that the engine is back firing out of the carburetor and always going high rpm, tuning the carburetor down, doesn't change anything, just that the engine dies off.
First idea was to test the intake valve, but the engine keeps pressure.
So propably it is a timing problem.
The engine got the original SSI ignition unit (#610906), which is triggered by two pins on the flywheel.
Now i see two points that could maybe be done, without pulling the engine. First thing, would be to check if the valves close at propper timing. So open the valve cover, bring the engine to tdc and check that both valves are closed, then bring to bdc and check that exhaust valve opens, back to tdc and check that exhaust closes, intake open, back to bdc, exhaust closes. If this is way out of timing, pull the engine and check that the timing marks on the crankshaft and camshaft match. So that would be pretty easy to accomplish.
If that works out propper, it must be the timing of the ignition, since it should be timed by the two triggerpins, my first thought would be to take the flywheel nut off, then check if the flywheel key is sheared. If that is the case, pull the flywheel and replace the flywheel key. But if that isn't the case, where to look then further?
Try to adjust it, by adjusting the gap between the ssi and flywheel, since it can only be moved up an down, not left/right?
I got the Tecumseh technician manual for the cast iron engines, but interestingly it doesn't cover timing the ignition. What you think. Would be happy it it also would be able to test it, without opening the cylinder head, since a new head gasket is about 140$ to get here in Europe, and cutting one myself from aluminium or copper sheet isn't what I would like to do.