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| | | | Joined: Nov 2003 Posts: 20 New Guy | | New Guy Joined: Nov 2003 Posts: 20 | Just finished rebuild on 84 truck 350 four bolt main. Runs great but...... 2 bolt holes at lower front passenger side edge near fuel pump will pump out oil on high rpm. Didn't do this before rebuild. Is it ok to plug these or does something go here that I lost? These same holes in my other truck aren't plugged and never leaked. What did I do wrong?????
Don | | | | | Joined: Nov 2006 Posts: 2,544 Shop Shark | | Shop Shark Joined: Nov 2006 Posts: 2,544 | You should put a 3/8" bolt in the top hole with some sealer on it. If you slide a screwdriver into the hole you will find that it goes into the passage for the fuel pump pushrod. | | | | | Joined: Feb 2004 Posts: 29,850 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,850 | That bolt needs to be really short- - - -like 1/2" long or so. Don't let it come into contact with the fuel pump pushrod!
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Jul 2013 Posts: 863 Shop Shark | | Shop Shark Joined: Jul 2013 Posts: 863 | Buy some Permatex Gasket maker in a tube....non-hardening formula. Cost is less than $4 bucks. Brown goopy stuff and it sticks to everything. Take the bolts out and clean them as well as the holes in the block. Rub a small amount around the bolt threads, just enough to cover the threads. Re-install the bolt and torque to specification. That should stop the leaks.
"Pay attention to the details! It ALWAYS pays off."
1949 Chevrolet 3100 Series 1/2 ton Pickup
1964 Chevrolet C10 (Ol' Yella) (SOLD)
1958 Chevrolet Biscayne 2 door (SOLD)
1970 VW Beetle
| | | | | Joined: May 2005 Posts: 8,983 Sir Searchalot | | Sir Searchalot Joined: May 2005 Posts: 8,983 | As said, there is a hole to put a long bolt in to hold rod up while installing pump, then replace with short bolt. They never needed any sealer in my experience, wouldn't hurt probably. A copper washer will work if you don't like sealer in there. Post picture of other leaker? Are you sure both leak or just one and spilling onto other? I think you will find the bottom hole is blind. You will find that when you put in a short 3/8 bolt in the top hole, the leak will go away as stated by Don and Jerry.
"These same holes in my other truck aren't plugged and never leaked"... ????????what engine? What year? is it FI? Better double check that!!
Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn
| | | | | Joined: Jul 2008 Posts: 1,262 Shop Shark | | Shop Shark Joined: Jul 2008 Posts: 1,262 | I apply some red rtv to the threads on a short bolt and screw it into the tapped hole, just as others above have stated. Here's more discussion on this topic from the Team Chevelle Website: A long enough bolt through that hole acts as a set screw into the side of the fuel pump push rod to hold it UP while changing the fuel pump.
Just don't forget to plug the hole with short bolt when done.
I bought a pickup one time that had nothing in the hole and oil was being blown back all over the motor by the coolant fan. Links here ----> thread link photo | | |
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