dxcody
10-24-2011, 09:59 PM
Ok so i was fixing my buddies 400ex (replaced the timing chain) and i got it all put on and everything and i started it up and it smoked out of the exhaust like you ran through cold water with a hot engine.
I asked him if it always did this and he said yea and i told him that it needed rebuilt. So he asked me to do it and so i tore it all apart this evening.
The piston is horrible, and smelt horrible i might add.. It was burning oil really bad. I told him (its a 426) the only thing to do if the cylinder is thinned out, is to go 440 or got back to stock.. The piston is not in bad shape at all, and the rings dont appear to be. (replacing them both anyways!) But i dont get why it was burning oil so bad? I remembered Ron saying cylinders often get "egg" shaped so i did this method... (idk if it works or not)
I took the top ring off the piston and put it in the top of cylinder, took a feeler guage that fit "snug" in the ring gap, moved the ring down to about middle of the sleeve, it had the same gap as it did in the top, and same for the bottom.
Could the rings just be worn? Like i said i am going to replace them anyways but i just didnt want to put it back together and it start burning oil again..
I asked him if it always did this and he said yea and i told him that it needed rebuilt. So he asked me to do it and so i tore it all apart this evening.
The piston is horrible, and smelt horrible i might add.. It was burning oil really bad. I told him (its a 426) the only thing to do if the cylinder is thinned out, is to go 440 or got back to stock.. The piston is not in bad shape at all, and the rings dont appear to be. (replacing them both anyways!) But i dont get why it was burning oil so bad? I remembered Ron saying cylinders often get "egg" shaped so i did this method... (idk if it works or not)
I took the top ring off the piston and put it in the top of cylinder, took a feeler guage that fit "snug" in the ring gap, moved the ring down to about middle of the sleeve, it had the same gap as it did in the top, and same for the bottom.
Could the rings just be worn? Like i said i am going to replace them anyways but i just didnt want to put it back together and it start burning oil again..