65 fuelie oil leak

[John S.]

Re: 65 fuelie oil leak

better resolution

[Timothy B.]

Re: 65 fuelie oil leak

John, I don't know much about FI but that fitting pulls the crankcase fumes out to be burned but did you check the other fitting where the engine breathes in for any restriction. If the engine will not breathe the crankcase will develop pressure from blowby and push the oil out.

[John S.]

Re: 65 fuelie oil leak

Guys,

Just uploaded 2 more pics I just took. Am out there really looking and I think it is pushing out the front gasket where the base plate meets the rail on the actual engine block. Looks to be an original style gasket and quiet literally is as hard as a rock. Other pic is of HN marking on front head passenger side. Honestly no matter what I want to be very careful about cleaning the whole area as I do not want to remove what I believe is an original marking. Any ideas or thoughts on front gasket and severity of leak? Could the high oil pressure be contributing to this. I need to look into the other stuff still.
John

[William C.]

Re: 65 fuelie oil leak

OK, your post sounded like a major leak, I was expecting to see oil on the top of the manifold! What you have is one of two issues, wither the seal between the rubber front gasket and the side gasket is not mated well, (possibly heads or manifold cut or just a mismatch during assy) or you have excess crankcase pressure and it is taking the path of least resistance to the outside. Engine new or old? c
Check all the stuff John DeGregory posted and see what you have?

[John H.]

Re: 65 fuelie oil leak

John -

Make sure there's a bolt in the upper of the two 3/8"-16 tapped holes right around the corner of the block from the fuel pump; if it's missing, that hole leads to the fuel pump pushrod hole in the block, and it'll leak oil all over the place. It takes a 3/8"-16 x 1/2" bolt with thread sealer.


ShippingBoltHoleSBC.jpg

[John S.]

Re: 65 fuelie oil leak

Any thoughts on the originality of the front gasket. The head markings? Will check for bolt when I get home Sunday.

[Jimmy B.]

Re: 65 fuelie oil leak

I would also speak to Mr. DeGregory about a possible f.i. distributor shaft seal leak.

[William C.]

Re: 65 fuelie oil leak

Pictures are showing the front of the engine, pretty well eliminates a distributor issue...

[John S.]

Re: 65 fuelie oil leak

Bill,
Just to clarify, I had already wiped up most of the puddled oil on top of the intake base plate with a rag. There was quite a bit there. Also am noticing that the fan was blowing it around.
John

[William C.]

Re: 65 fuelie oil leak

OK, if the fan is blowing it around that would indicate a front of the engine leak. That invloves the front seal on the manifold, the Bolt in the front of the block mentioned by John H. front seal on the crank. is the oil predominately at the front of the manifold or the rear, in which case other options arise. Pictures after cleanup are not a diagnostic tool. If the engine is just running and you look at it do you see any source of the leak?

[John S.]

Re: 65 fuelie oil leak

Bill,
Yes I thought about that after I cleaned it up. I will check for bolt when I get home and then clean up more and try and figure it out. Oil was definitely coming from the front.

[John S.]

Re: 65 fuelie oil leak

Per John Hinkley's postthe bolt is there. Narrowing down I guess.

[James G.]

Re: 65 fuelie oil leak

My guess, original low mile engine, that has been a sleep for 40 years. It finally had a ''real ride'' at 5500-6500 RPM and hopefully nothing got hurt. CRANKCASE pressure. Start the engine, and take oil cap off while engine idels. Is it ''puffing'' like a old freight train? Maybe a cracked ring. Pull all 8 spark plugs and take a look. Get a lighted scope where you can see inside each cylinder.

Good friend Mark Francious had similar problems on his 65 fuelie. Pulled the engine and discovered a cracked oil ring. Miles were 67000 plus. ENGINE HAD NEVER BEEN APART.
He had it rebuilt, and it is one of the nicest original cars out there today.

[John S.]

Re: 65 fuelie oil leak

I checked the 90 degree fitting on the front that acts as part of PVC system. It is exactly .107 hole size. Checked with Vermont pin Gage's and it is right there. Appears to be original. I believe the relief valve assy in the oil pump is stuck. That would explain the high oil pressure. Car was only driven 5 miles in aprox. 7 years. The oil filler cap gasket is as hard as a rock and basically useless. Will replace that and take for a drive and see what happens. Will be focusing on the high oil pressure next.

[John D.]

Re: 65 fuelie oil leak

Hi John etal, Not to rob your post here but I incountered a similiar situation today on a customers solid axle Corvette. Not mentiong the year or anything about the car to protect my customers privacy.
At idle the oil guage showed at least 5O. When we revved up the engine the oil white needle practically stuck out the bottom of the dash board. I mean it was pegged big time.
The owner said the engine was built by a speed shop. That should tell you right there that someone put in a big time high pressure oil pump. Whew!!!!
After all these years of playing with Fi's I fail to understand just why engine builders think our Corvettes need such an animal of an oil pump.
Anyhow John I was right when I said you need a Melling M55 oil pump. Plain M55 with no suffix after the number. JD