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New Motor Oil Leak

Discussion in 'Chevy Trucks' started by MTCK, May 21, 2001.

  1. MTCK

    MTCK Senior Member
    Messages: 346

    Hey guys. I have a sort of baffeling problem that I'm hoping that one of you had, and will just say "oh yeah, here's what you did wrong." In my 1983 K10, I had a 305 with a 700r4 tranny with about 120,000 hard miles on it. I just finished this years schooling in Idaho, and am about to drive back up the highway home, to Alaska. Basically, on my way to Boise to pick up my driving partner, the motor gave up the ghost. Started knocking bad, spit all it's oil out, and I barelly limped to boise. I had limited options, as we had to be in seattle this weekend and had to drive home (tomorrow). So I went to Napa, plunked down about 700 bucks and picked up a replacement motor. Had to get another 305 as they wouldn't take my 305 on a core replacement for a 350. Oh well, I'm planning on selling this truck at home this summer and picking up another diesel. OK so here's the problem:

    The new motor leaks oil. Quite a bit. About a quart every 80-100 miles. I've already put 1200 on it, so this is sorta making a mess. The valve covers are sealed up good. So is the oil pan. It only leaks when driving under load (idling doesn't do it). The oil pressure sending unit, along with the intake are sealed up good too. Here's my thought; I halfway remember there being some sort of plastic nipple looking fitting on the passenger side of the block about halfway between the oil pan and the head. Is it possible we left something out? We really don't have time to mess with it, so the truck is going to the shop this afternoon. If anyone has replaced one of these motors and has insight, I'd appreciate it as it would save me a lot of shop time (= big bucks) if I could just tell the guy where the hole is (if that's the case) and to plug it. Oh, some details, the motor has an Edelbrock Performer intake, HEI vacuum advance ignition, performer carb, hedman hedders to dual exhaust and other than that is pretty much stock. Thanks a ton guys.
  2. MTCK

    MTCK Senior Member
    Messages: 346


    Made it home. Fixed the oil leak by resealing the back of the intake manifold, and putting on new valve covers and gaskets. The motor worked flawlessly all the way home, as did the transmission. Blew out a tire out in the middle of nowhere in british colombia, and ended up sleeping in the ditch that night, and walking to a small repair shop to get another which happened to be about 800 yards away. Talk about luck. Ever since I've had the new motor in the truck has had about 2500 pounds of STUFF in the back of it, and it's empty now. Wow, I got sooo much power back. I chirped the tires accidently for the firs time in about 5 years. Now it'll flat burn them off through first and half of second also. Hmmm, better sell it quick before something breaks.
  3. 85w/350

    85w/350 Senior Member
    Messages: 190

    might have to check that out on my 82"the workhorse" leaks about the same 1quart every 80-100miles. I know it leaks and not burns because the whole underside is coated