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Old 11-03-2005, 08:59 PM
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hole in oil pan

I got an engine from a local salvage yard a 350 Chevy motor this yard drains the oil from their motors by punching a hole in the oil pan and put a rubber plug in the hole. I've had the engine in my 1969 C10 for over a year. I was on the highway doing 60 to 70mph when I look in my rear view mirror and seen a cloud of smoke that did not last long and there was no lost power for about a quarter of a mile. I pull over as I did the motor went dead I got out look under the truck there was a steady stream of oil from under truck. I had it towed home and inspected closer and found that that rubber plug had fell out. I patch the oil pan and started truck it started right up with this knock from the bottom of the engine. I drove it the knock would dissipate when i speed up and return when I slow down and while it idles. HELP!!!

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Old 11-03-2005, 09:17 PM
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Sounds like a rod from what you describe, particularly hearing it when you come back down from load. Main you can usually only hear at idle. You should be able to hear it slap around when you put it in neutral and rev it a bit, too. You'll need a new motor, whether you rebuild this one or get another one from the yard.

There's a positive pressure in that crankcase, so it probably eventually pushed and lubricated that plug enough, heated and cooled it enough so that one day it gave up. Bad luck... did you know about the plug before this?

Lastly, I do think its pretty dumb that they even use a plug like that in the first place. Why ruin a perfectly good oil pan just because you're too lazy to get out a 9/16ths inch wrench?! Lol, I wonder what they do for the cast aluminum pans? Probalby just hit it with a hammer and knock a chunk out of it.

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Old 11-03-2005, 10:06 PM
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I dont know about where you live but most of the junk yards around here are trashy and they dont care about what they do to the cars. I'll never go to one around here, especially one where they drain the oil by punching a hole in the pan. People like that shouldnt be working on cars, I dont care if it is junk a junkyard. I'd hate to see what some of their cars look like.
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Old 11-04-2005, 05:16 AM
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not to rub salt in an open wound,but i don't think i would have left a rubber plug in the pan to begin with.din't you have another motor you could have switch the pans with?i would have at least patched it with JB weld if you don't have a welder.if you want to make it last longer with out putting money in it,i have seen people at this point take the motor out and put a new bearing in where its needed and have good luck while doing the most minimal work possible.this is assumming that the motor is only half worn out.its a risk .you just have to decide if you are willing to take it.you can always overhaul it it doesn't work.sorry about the salt .i wish you the best of luck.
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