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07-08-2020, 07:17 PM | #1 |
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Join Date: Aug 2010
Location: Hoofddorp, the Netherlands
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Help! 283 unidentified oil leak
I have a question regarding my '66 283 engine.
Last weekend I swapped my th350 for a 700R4, which bolted right in. I started it for the first time and shut it off after a few seconds, just to do a double check on the oil cooling lines and such. To my suprise engine oil was running out on the side of the oilfilter (screw on type btw) and I mean gushing..so going over my steps I suddenly realised when taking the th350 out, 1 bolt was missing from the belhousing on the bottom left, right behind the oilfilter. Luckily I found one roughly the same length and the right thread. (the one on the left) with the car back on the lift, I suddenly realised what a rookie mistake I made, by not first checking whether the bolt wasn't to long. and see here why I couldn't believe my stupidity and took off the oilfilter to asses the damage I had done. but after cleaning it up, I could't see a crack and then thought there must be a hollow space behind it. 45min later the transmission was out again, because I wanted to have a look in the thread holes to see if I can see the damage i'd done. here are the close-ups of the holes to my opinion, the holes all look intact, but I have no idea how it should look like when I screwed in a bolt thats to long. I read that the filter mounting plates are notorious for leaks, but I didn't touch it during the tranny change.. so my friends, what could possible be the problem?
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07-08-2020, 07:51 PM | #2 |
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Location: Eastern TN
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Re: Help! 283 unidentified oil leak
The oil sending unit line is right at the top of the engine block just behind the surface the bellhousing hooks to. O bet you kinked it or pulled it loose when removing the vacuum line for the modulator.
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07-08-2020, 08:44 PM | #3 |
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Re: Help! 283 unidentified oil leak
I think you are missing the nut that clamps the lower filter plate to the upper plate....
Without the nut, the plate will leak.... see pic
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07-09-2020, 12:24 AM | #4 |
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Re: Help! 283 unidentified oil leak
Neither one of those bolts is correct. The bell housing bolts should be 1-1/4'' long. The short one is only going to grab about 3 threads
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07-09-2020, 03:45 AM | #5 | ||
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Re: Help! 283 unidentified oil leak
Quote:
Quote:
Thanks, thats definetly something to look at.
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Feedback is always welcome! projects: 1969 Chevy C10 1950 GMC 100 1958 Chevy C60 Viking ratrod Last edited by Steve-W; 07-09-2020 at 03:56 AM. |
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07-09-2020, 10:30 AM | #6 |
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Location: Ozark, MO
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Re: Help! 283 unidentified oil leak
I had a 305 once that I literally sealed and re-sealed everything twice chasing a leak, later to discover that a longer than normal bellhousing bolt in that same position had broken through a thin part of the block casting at the bottom of the hole and had become pressurized. It appeared as a leak similar to yours. I got the correct bolt, thread sealed it and bingo, fixed.
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07-09-2020, 12:06 PM | #7 |
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Join Date: Jul 2012
Location: Whitehorse yukon
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Re: Help! 283 unidentified oil leak
You can use the newer style adapter
I did this on my dads 283 a long time ago I have not used the style with a center nut but i can see with it missing that it may be a leak issue by not properly sandwiching it to together |
07-10-2020, 09:59 AM | #8 | |
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Re: Help! 283 unidentified oil leak
Quote:
Well, there doesn't seem to be a problem with the adapter, picked up a central nut for it yesterday and a new rubber seal..which is not OEM, but if fits and is slightly thicker, so I hope will give a better result.
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07-17-2020, 07:40 AM | #9 |
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Join Date: Jun 2017
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Re: Help! 283 unidentified oil leak
Hey there...How did you go with the oil leak issue?
Trust you are doing ok....
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Family and country before all others... 2006 Chevy Silverado (Daily Driver) 2012 Chevy Equinox |
07-24-2020, 10:11 AM | #10 | |
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Join Date: Aug 2010
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Re: Help! 283 unidentified oil leak
Quote:
But.. I have other issues now, which I'll write up in my C10 cleanup thread (spoiler allert: the 700R4 I bought is a lemon)
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07-24-2020, 02:51 PM | #11 |
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Join Date: Jun 2017
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Re: Help! 283 unidentified oil leak
Put the post for the 700R4 issues in the Driveline section for quicker feedback...
Here is the link... https://67-72chevytrucks.com/vboard/...splay.php?f=24 Glad you figured out the oil leak...
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Family and country before all others... 2006 Chevy Silverado (Daily Driver) 2012 Chevy Equinox |
07-24-2020, 09:06 PM | #12 | |
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Re: Help! 283 unidentified oil leak
Quote:
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