Hi everyone!
I am new to this forum and I am looking for some advice. I purchased a used MTD Yard Machine, with a 12.5 HP, 28T707-1154-E1 B&G
engine for 175.00. It started right up, but it acted weird. The PO said he replaced the crankshaft and piston rings, but thinks the rings weren't setup correctly. I took the engine apart and the crankshaft looked original and I noticed the gaskets were all original. For sure the PO did not replace anything internal, however while the head was off I saw the counterweight was broken into several pieces. I ordered a new counterweight, which was very difficult to find because B&G no longer makes the part!
I put everything back together, replaced the drive belt with a new one, went to start it and the engine just clicks. It does not turn. I checked the belts and the engine to see if there were any obstacles in the way, but everything looked good. I tried turning the engine with my hand, with the spark plug removed of course and it barely moved. I tried using my socket wrench at the pulley and it was very difficult to rotate the engine. I went at it at the flywheel and as I kept trying to rotate the engine, it started to turn a little easier, but by a certain point during rotation, it gets hard to turn and then it gets easier, then hard, then easier, etc, etc.. Basically, by one full rotation, it gets tight then it's easier to turn, then tight again, which I assume is when the piston is at TDC and compression is formed, but again, the spark plug is out. There shouldn't really be compression. I used assembly lube on the crankshaft journals, rod bearings, cam lobes, and counterweight.
Does anyone know what might be wrong? I made sure the engine was timed and at TDC before putting it back together.
Thanks in advance!
I am new to this forum and I am looking for some advice. I purchased a used MTD Yard Machine, with a 12.5 HP, 28T707-1154-E1 B&G
engine for 175.00. It started right up, but it acted weird. The PO said he replaced the crankshaft and piston rings, but thinks the rings weren't setup correctly. I took the engine apart and the crankshaft looked original and I noticed the gaskets were all original. For sure the PO did not replace anything internal, however while the head was off I saw the counterweight was broken into several pieces. I ordered a new counterweight, which was very difficult to find because B&G no longer makes the part!
I put everything back together, replaced the drive belt with a new one, went to start it and the engine just clicks. It does not turn. I checked the belts and the engine to see if there were any obstacles in the way, but everything looked good. I tried turning the engine with my hand, with the spark plug removed of course and it barely moved. I tried using my socket wrench at the pulley and it was very difficult to rotate the engine. I went at it at the flywheel and as I kept trying to rotate the engine, it started to turn a little easier, but by a certain point during rotation, it gets hard to turn and then it gets easier, then hard, then easier, etc, etc.. Basically, by one full rotation, it gets tight then it's easier to turn, then tight again, which I assume is when the piston is at TDC and compression is formed, but again, the spark plug is out. There shouldn't really be compression. I used assembly lube on the crankshaft journals, rod bearings, cam lobes, and counterweight.
Does anyone know what might be wrong? I made sure the engine was timed and at TDC before putting it back together.
Thanks in advance!