Con Rod Question
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oldmerc
Joined: Jul 2011
Posts: 1,538
Likes: 5
From: Edmonton,Alberta
Con Rod Question
Hello folks
I hope this is not a stupid question.
We are in the process of rebuilding 49 8BA ,I notice the con rods
appear to have been welded over what I think is the oil squirt hole
What gives?
Allan
I hope this is not a stupid question.
We are in the process of rebuilding 49 8BA ,I notice the con rods
appear to have been welded over what I think is the oil squirt hole
What gives?
Allan
Cargo Master
Joined: Jun 2001
Posts: 2,571
Likes: 22
From: Oxford, Indiana
Yeahhh, those holes sorta need to be there. That's what lubes the camshaft and tappets. Modern oils with their low ZDDP levels are hard enough on cams the way they are let alone cutting off most of their lube completely. I think I'd try to find a good used set of rods rather than open them back up. Unless it is done under carefully controlled conditions, welding on cast iron is a bad idea on a critical high-stress piece like a connecting rod. It can cause microscopic stress fractures if it cools too quickly. Smells to me like an extra hole in an oil pan waiting to happen.
Cargo Master
Joined: Aug 2010
Posts: 2,919
Likes: 128
From: Houston
Fleet Owner
Joined: Jul 2004
Posts: 27,287
Likes: 1,052
From: NM
The stock rods are forgings, so you could open the holes back up, but the holes need to be a specific size. Depending whether they just laid a bead over the top of the hole or really got penetration, they might need re-drilling. Welding may have distorted the big end out-of-round, too. All in all, swapping to a different set is likely the economical way to go.
38 Coupe, I am shocked that those are brand new! Chinese? Unbelievable price. Any experience?
38 Coupe, I am shocked that those are brand new! Chinese? Unbelievable price. Any experience?
Thread Starter
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oldmerc
Joined: Jul 2011
Posts: 1,538
Likes: 5
From: Edmonton,Alberta
I believe I will try to drill them out ,resize and balance .
whats the worst that can happen
I'll bloww another engine up
whats the worst that can happen
I'll bloww another engine up
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Fleet Owner
Joined: Jul 2004
Posts: 27,287
Likes: 1,052
From: NM
Well, then why drill them out? 59 engines used essentially the same rods with no holes. The holes were added when they upgraded to the bigger oil pump in 8BAs.
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Cargo Master
Joined: Aug 2010
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From: Houston
Those are new rods out of the French flatheads. The French government kept using flatheads in their military vehicles into the 1980s. Most all the flathead parts shown on that website are military surplus. I have purchase a set of French rods for one of my projects and they look good. Why recondition rods when you can buy a whole new set for the same price?
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