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Bolt fell off engine by oil line
#1376920 Sun Sep 13 2020 06:44 PM
Joined: Sep 2020
Posts: 6
5
53Fred Offline OP
New Guy
Trucks been home a week and i wanted to clean off some
Of the engine as i was wiping a bolt fell off in my hand. Pic below. Go easy on me my Dad was the brains of this restoration when i started. He passed away so your the next best thing! What is this hole? I looked at diagrams maybe a drain? Its not leaking but what do i do next! Thank you! I circles the hole in my pic!

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Re: Bolt fell off engine by oil line
53Fred #1376937 Sun Sep 13 2020 10:29 PM
Joined: Jan 2017
Posts: 74
G
Wrench Fetcher
That appears to be the drain plug for the water jacket. Not surprised it isn’t leaking as they get plugged up with junk. Mine didn’t leak when I threaded it out.


1951 GMC 9430 long box w/ hoist
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Re: Bolt fell off engine by oil line
53Fred #1376945 Sun Sep 13 2020 11:41 PM
Joined: Apr 2008
Posts: 796
F
Shop Shark
Agreed, I have a petcock installed there. Might want to clean it out with a stiff wire (with the accompanying flow of coolant). I'd consider a good flush of the cooling system too.


Ed
Re: Bolt fell off engine by oil line
GMCanada9430 #1376947 Sun Sep 13 2020 11:44 PM
Joined: Sep 2020
Posts: 6
5
53Fred Offline OP
New Guy
Any idea how long the bolt was? Ill have to have it removed and replaced. I think i saw a petcock in one of the diagrams.

Re: Bolt fell off engine by oil line
53Fred #1376975 Mon Sep 14 2020 03:18 AM
Joined: Feb 2001
Posts: 1,136
D
Shop Shark
It is not a bolt.

It is a taper thread plug.

As Forty9 says above, install a petcock (tap) there it assist future maintenance.

The block is thin there, perhaps only 3/8" , so the plug will be short.

Re: Bolt fell off engine by oil line
53Fred #1376980 Mon Sep 14 2020 04:02 AM
Joined: Apr 2002
Posts: 1,738
F
Fox Offline
A teacher, but always an apprentice.
I used a straightened coat hanger to dig out mine. It was full of crud. I then pressure washed that hole to break it loose even more. I, however, was doing a full rebuild and hot tanked the block soon after. You probably don’t want that crap making its way into the water pump. Flush it. Lots.

Last edited by Fox; Mon Sep 14 2020 04:03 AM.

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Re: Bolt fell off engine by oil line
53Fred #1377031 Mon Sep 14 2020 07:27 PM
Joined: Feb 2004
Posts: 21,064
H
Boltergeist
Clean the hole out with a 20 gauge shotgun brush in a drill motor and chase the threads with a 1/4" pipe tap. Install a new pipe plug with a dab of Permatex #3 sealer on it and you're good to go for another 50-something years.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Bolt fell off engine by oil line
53Fred #1377073 Tue Sep 15 2020 12:12 AM
Joined: Sep 2020
Posts: 6
5
53Fred Offline OP
New Guy
Thanks for all the info so glad i have all of you! Someone put a bolt in the hole (pic attached) but ill work to get the right plug and get it cleaned out!!

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Re: Bolt fell off engine by oil line
53Fred #1377154 Tue Sep 15 2020 04:37 PM
Joined: Mar 2002
Posts: 9,031
Master Gabster
I would suggest that there is no need to clean that out unless you want to drain the block. A plug with pipe threads is what you need.


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1951 1 Ton Completed


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Re: Bolt fell off engine by oil line
53Fred #1377172 Tue Sep 15 2020 06:57 PM
Joined: Jan 2020
Posts: 500
D
Shop Shark
A word of caution, I cracked a head on a 42' 216. the # 1. The temp gauge was not getting any water to it. For some reason the older 216's have this problem with flow if the water jacket is not flushed before starting up. A lot of folks didn't run anti freeze I suppose. You probably need to ask the folks here, the 235, 261's have larger jackets. Doc.

Last edited by Doc.Hall; Tue Sep 15 2020 07:02 PM. Reason: additional info

Currently making 1954 3100 better than new

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