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02-06-2018, 05:25 PM
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#1 |
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Registered User
Join Date: Oct 2017
Location: Medford Wisconsin
Posts: 50
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87 small block 350 oil leak?
I don’t have pictures but what could be leaking oil on the drivers side, like 3 inches above the filter on the side of the block. I just took a quick peak and I couldn’t really tell what it was, looked like a sensor of some sort.
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02-06-2018, 07:04 PM
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#2 |
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Registered User
Join Date: Jul 2017
Location: OKC, OK
Posts: 247
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Re: 87 small block 350 oil leak?
That's the oil pressure sensor that feeds input to the gauge. I think there are two on those years. One that sends input to the dash, and one that sends input to the ECM.
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02-06-2018, 07:06 PM
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#3 |
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Registered User
Join Date: Oct 2017
Location: Medford Wisconsin
Posts: 50
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Re: 87 small block 350 oil leak?
Anybody know if they both are the same part numbers or if they are different what are the part numbers?
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02-06-2018, 07:12 PM
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#4 |
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Moderator
 
Join Date: Jul 2006
Location: Ozark, MO
Posts: 4,888
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Re: 87 small block 350 oil leak?
Story time...had an '87 350 original engine to the truck which had an oil leak only at speed. Would not leak at idle or sitting still with RPM. I started with all of the basic bolt-on stuff that appeared to be leaking; dist gasket, VC gaskets, oil pressure sensor, etc. No luck. Then I moved on to the big stuff which I actually pulled the engine for; oil pan, rear main, front seal, etc. I thought I'd be sitting pretty...wrong! I was going crazy with this leak because it was so hard to pinpoint. I did UV dye, cleaned, de-greased several times. At the end of my patience, on a hunch, I pulled each bell housing bolt individually and discovered that one was about .25" longer. I shined a light in that hole and what do you know, it had no bottom. The longer bolt had punched it through and oil was coming out around the threads, but only at speed. I sealed the bolt, all good! But man, never been so beat by an oil leak.
__________________
'20 Silverado Trail Boss ~ '17 Tahoe ~ '79 K15 Sierra Grande ~ '76 Blazer 2wd ~ '71 Cheyenne swb ~ '55 Pontiac Safari ~'50 3100 bagged ~ '80 Wife ~ Late model kids
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02-06-2018, 07:47 PM
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#5 | |
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Registered User
Join Date: Jul 2017
Location: OKC, OK
Posts: 247
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Re: 87 small block 350 oil leak?
Quote:
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02-06-2018, 11:02 PM
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#6 |
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Registered User
Join Date: May 2012
Location: horseheads,ny rust belt
Posts: 2,794
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Re: 87 small block 350 oil leak?
2 different sensors
and be sure to hold the adapter its screwed in to or you will brake it .
__________________
77-k30lb BIG truck build . 87-k30lb budget beater build . 85-k30lb the plow machine build . 85-c10sb summer fun toy . ----------------------------- HOLLEY SNIPER efi = worst case of p.i.t.a i ever had . EDELBROCK pro flo 4 = best deal going so far . love my setup works great. |
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02-07-2018, 04:35 PM
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#7 |
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Registered User
Join Date: Oct 2017
Location: Medford Wisconsin
Posts: 50
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Re: 87 small block 350 oil leak?
Anybody know part numbers, rock auto I could only find one for the sensor. Not sure which is which.
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02-07-2018, 05:01 PM
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#8 |
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Registered User
Join Date: Feb 2005
Location: EAST TENNESSEE
Posts: 233
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Re: 87 small block 350 oil leak?
One is a sending unit and one is a switch
__________________
1980 Silverado short bed 1993 GMC 1500 LS swap 2006 Lifted Z71 Crew Cab |
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