Bob Creighton
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- Joined
- May 7, 2009
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How easy or hard is it to change the rear main seal on a 340 eng? Thanks.:blob:
Are you absolutely, 100% sure it's the rear main..
There are several places the oil can leak, then it migrates to the back of the engine with the help of the fan,, and drips off the back of the pan..
I would clean the begeebees outta the whole area with a coupla cans of brake-clean,, then look closely at the oil pressure sender beside the distributor, check valve covers,, and gently snug the oil pan bolts, the oil filter adaptor can leak onto the pan gskt, and run to the back. dripping far away from where the leak is..
I know by experience to look everywhere else to be sure, cuz you're gonna be real dissappointed doing all that work to replace the rear main, just to find out it leaking from the fuel pump, or some such..
hope it helps
Are you absolutely, 100% sure it's the rear main..
There are several places the oil can leak, then it migrates to the back of the engine with the help of the fan,, and drips off the back of the pan..
I would clean the begeebees outta the whole area with a coupla cans of brake-clean,, then look closely at the oil pressure sender beside the distributor, check valve covers,, and gently snug the oil pan bolts, the oil filter adaptor can leak onto the pan gskt, and run to the back. dripping far away from where the leak is..
I know by experience to look everywhere else to be sure, cuz you're gonna be real dissappointed doing all that work to replace the rear main, just to find out it leaking from the fuel pump, or some such..
hope it helps
the 340 in the swinger I just finished up had a leak at the rear main. I used the dye kit and not only found the seal leaking, but the oil pan had a crack where the oil pump bolt had worn through. I would have never seen it without the dye kit. I did change the seal in the car and it was no problem. It turned out the crank seal surface was not in the best shape and I had to clean it up with some emery cloth.If I recall you use to be able to buy a dye to put in the oil to help spot the leaks after cleaning the block and surrounding areas. May help see where the leaks are.