Pulling a piston, 300 I6
Lead Driver
Joined: Mar 2008
Posts: 7,182
Likes: 378
From: Near Los Angeles
If one bearing is shot, others can not be far behind. I vote for the rebuild too. You don't want to go to the trouble of changing one, and then a couple of months having to go through the entire process again. You can always get a j.yard rod or crank if you need it, and have it machined. Have the machine shop check the bore, the crank, and rods. Replace the bearings, rings, gaskets; rods, crank, pistons as needed.
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Junior User
Joined: Sep 2010
Posts: 89
Likes: 1
From: California
Most of you are absoluely correct
Yeah, I did try it and Kotzy, you are certainly correct.....there is no room between the webs of the block casting to get a 4" piston out from the bottom. Cant be done! No way, no how.
Thanks folks, all of you for your input and.......BTW I did take a some other advice. I decided not to go cheap after all, a complete rebuild. Had my crank turned and balanced. New rods, re ringed pistons, checked the oil pump outer race to housing clearance and the rotor assembly clearance and the specs were well within tolerance. I'm beginning to believe someone's been inside this 300 before. Also found 1 exhaust valve different from the rest suggesting someone at one time had the valves done. No matter, I'm doing them again. WAY too much work to go cheap or skip something that's marginal. Thanks again everyone!!!!!!!!
Thanks folks, all of you for your input and.......BTW I did take a some other advice. I decided not to go cheap after all, a complete rebuild. Had my crank turned and balanced. New rods, re ringed pistons, checked the oil pump outer race to housing clearance and the rotor assembly clearance and the specs were well within tolerance. I'm beginning to believe someone's been inside this 300 before. Also found 1 exhaust valve different from the rest suggesting someone at one time had the valves done. No matter, I'm doing them again. WAY too much work to go cheap or skip something that's marginal. Thanks again everyone!!!!!!!!
Elder User
Joined: Apr 2004
Posts: 970
Likes: 3
The 300 is a very strong reliable engine. The block must be a cast iron alloy because the bores show so little wear providing they are not neglected. In all of them I had apart years ago the only problem I found is the way the cam bearings oil the mains and rods. Had they grooved the cam bearing bores and carried the oil around the back side of the cam bearings they would have been able to restrict the flow to the cam bearings thru a metered hole and not loose pressure thru them when they wore. kotzy
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