Gen 4 connecting rod bolts
Thread Starter
Teching In
Joined: Feb 2018
Posts: 22
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From: Da UP , MI
Gen 4 connecting rod bolts Hey all, I tore my 5.3 apart to find that it was rebuilt. Anyway I had to do some gapping of the rings since they were way too tight. Well I'm reusing my connecting rod bolts and am wondering what to torque them to? I dont think the angle method is relevant when reusing the bolt but maybe I'm wrong. I was thinking a pass of 15 flbs and take it to 50? Seen a few YouTube videos. Just wondering how many people are doing that. They are gen 4 rods too by the way..
Rod bolts can be reused, and the factory torque specs should be followed using the specified lube on the threads and under the head. The rod bolts are not the same as the other "torque to yield" fasteners on the engine. While the rod bolts have a "torque angle" requirement, that is not the same a "torque to yield".
The manual calls for 15 lbft + 85 degrees, use that.
Cole
The manual calls for 15 lbft + 85 degrees, use that.
Cole
You can reuse them. They are torque to angle and not torque to yield.
Follow the OE tq, don't try to outsmart the engineers that tested the bolts.
Like Cole said, 15 ft lb + 85 degrees
Follow the OE tq, don't try to outsmart the engineers that tested the bolts.
Like Cole said, 15 ft lb + 85 degrees
Correct, tighten the rod bolts to 15 lbs and then tighten further about a quarter of a turn. The bolts interchange OK, but the caps won't. Each cap is fracture cut for each rod. So do not interchange rod caps.
TECH Junkie
Joined: Jun 2008
Posts: 3,204
Likes: 1,391
From: Nitro Alley
Gen III connecting rod bolts are spec'd @ 15.00 Ft/Lbs + 60.00 degrees.
Gen IV connecting rod bolts are spec'd @ 15.00 Ft/Lbs + 75.00 degrees.
These torque values are as such when properly lubricated with some variant of 30 weight engine oil.
The threads and underside of the bolt head are to be lubricated.
Note: Aftermarket fasteners will usually have a unique or special torque specification... Such as ARP connecting rod bolts.
ARP fasteners will also include a specialized lubricant that helps to improve the uniformity and accuracy or the bolt torque.
Pay special attention to wither or not a torque spec is dry or lubricated... and as such, with what lubricant.
For future engine building; a connecting rod bolt stretch gauge would be ideal to use or to own... as connecting rod bolts are one of the most stressed parts in these engines.
Inexpensive models can be found for close to $50.00 to $70.00 from many retailers.
Gen IV connecting rod bolts are spec'd @ 15.00 Ft/Lbs + 75.00 degrees.
These torque values are as such when properly lubricated with some variant of 30 weight engine oil.
The threads and underside of the bolt head are to be lubricated.
Note: Aftermarket fasteners will usually have a unique or special torque specification... Such as ARP connecting rod bolts.
ARP fasteners will also include a specialized lubricant that helps to improve the uniformity and accuracy or the bolt torque.
Pay special attention to wither or not a torque spec is dry or lubricated... and as such, with what lubricant.
For future engine building; a connecting rod bolt stretch gauge would be ideal to use or to own... as connecting rod bolts are one of the most stressed parts in these engines.
Inexpensive models can be found for close to $50.00 to $70.00 from many retailers.
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TECH Junkie
Joined: Jun 2008
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From: Nitro Alley
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Verdad Gallardo Maybe you should not be so dramatic...amongst other things. Also taking his name in vain like that is a bit much. You seem like too much of a perfectionist to miss a 7 for an 8 also.
Im no God, but i do assemble engines, design parts, and sell them, give tech support on many platforms for a living also as well as help sponsor this forum you are using to pass on bad info.
I come down hard on bad info because any google search could bring this up and then people will see what you say and claim and even though its bad or wrong, will recycle it for one reason or another.
Im no God, but i do assemble engines, design parts, and sell them, give tech support on many platforms for a living also as well as help sponsor this forum you are using to pass on bad info.
I come down hard on bad info because any google search could bring this up and then people will see what you say and claim and even though its bad or wrong, will recycle it for one reason or another.
TECH Junkie
Joined: Jun 2008
Posts: 3,204
Likes: 1,391
From: Nitro Alley
Maybe you should not be so dramatic...amongst other things. Also taking his name in vain like that is a bit much. You seem like too much of a perfectionist to miss a 7 for an 8 also.
Im no God, but i do assemble engines, design parts, and sell them, give tech support on many platforms for a living also as well as help sponsor this forum you are using to pass on bad info.
I come down hard on bad info because any google search could bring this up and then people will see what you say and claim and even though its bad or wrong, will recycle it for one reason or another.
Im no God, but i do assemble engines, design parts, and sell them, give tech support on many platforms for a living also as well as help sponsor this forum you are using to pass on bad info.
I come down hard on bad info because any google search could bring this up and then people will see what you say and claim and even though its bad or wrong, will recycle it for one reason or another.
I would do the same thing, but usually in a more supportive way.
The issue here is we can't agree on the "BAD information"
I say it is your info...
and you say it's my info...
TECH Senior Member
Joined: Jun 2016
Posts: 22,306
Likes: 3,620
From: Central Cal.
YOUR info was the bad info! Factory (who you worked for...) says 15 plus 85 degrees, which is MORE than you stated above. Do you know more than your former employer?
I’ve done the legwork and it’s 47-48 ft. Lbs. That’s the value I use for Oem gen 4 rod bolts, but I’d rather not post that up as an answer to someone’s question, because the bolt isn’t designed for that. It’s designed for 15 ft. Lbs. + 85 degrees.
You're the only person in the thread that agrees with you, everyone else agrees with him, and you still think you're right???