Question about McCulloch 13HP 338 Cc Portable Generator # FG6000MK

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My fg6000mk i think the rod cap that connects the rod to the crank has broke or just came off. i can remove the spark plug and the piston is at full stroke. i can take a small 12inch 1/4" extension and push the piston down and slowly pull the cord and the piston pushes back up to the end stroke position. about to pull it apart but i was told it is hard to find the parts.? need help locating parts and part numbers for that piece so i can fix it.

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Tear it down if indeed this happened i highly suggest you replace engine that will interchange with one that you can fix cheaper and easier the old engine with that damage will not be worth fixing hope this helps

Posted on Aug 30, 2010


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It's related, The connecting rod pins may have gotten damaged and needs to be replaced. The knock you are getting sounds like the piston slap due to the connecting pins being damaged and the piston is moving around the cylinder walls and connecting rod. When the spark plugs wire was crossed the wrong spark plugs fired while the piston was still on it's way up the cylinder as to having it fire on the way down. This will cause stress to the valve's, piston, connecting pins, crank shaft, and main bearings. In short all the internal lower moving parts to an engine. Good Luck and have a compression test on all the cylinders and the one that is damaged will be the lowest compression reading.

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1 Answer

Engine cranks slowly after overhaul

the only thing i can think of is
1. did you check the journal clearance to the main and rod caps? if this isnt within specs could be too tight.
2. did you put the rod caps and main berring caps on the same way you took them did you mark every thing 1 for #1 2 for #2 ect. if you installed the berring caps the oppsite way or didnt keep them in order some thing could be out of round causing tightness.
3. the same goes for pistons.......the mark should be pointing front for all. (ch approiate engine rebuild for info)
i would recomend trying to remove all spark plugs and try to turn the engine by hand( DO NOT TURN IT BACKWARDS>see which way the starter turns the motor) feel how it turns. if its hard then easy some thing is out of round poss installed wrong. personally id take down the pan and check the install. also take valve covers off ck the clearence of rocker arms. check your pushrods valve motion ect. you might also might want to break it down before you do some expensive damage.
tip.....if you didnt mark the rods and main berring caps and might have put them together incorrectly, remove the berrings and look at the honing marks. with patience and a good light you can see if they are lined up(cap and block for mains and cap and rod for connecting rods.) ie the cross marks line up.
good luck

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