Micro Welding of bearing shell to rod housing bore - Page 3

Larry Hill · 08-24-2021, 07:37 AM

The caps have dowels and the mating surface looks perfect. The upper shell is always not as tight as the cap shell in its bore.

Is there a certain finish that the bore needs to “hold” the bearings?

Rich Biebel · 08-24-2021, 08:18 AM

I've been reading this thread and wondered why no one mentioned detonation as being a possible issue.

It can show up in rod bearings....

Usually the shells just fall out....and might have some odd looking wear marks....

CMcAllister · 08-24-2021, 11:21 AM

Quote:

Originally Posted by Rich Biebel

I've been reading this thread and wondered why no one mentioned detonation as being a possible issue.

It can show up in rod bearings....

Usually the shells just fall out....and might have some odd looking wear marks....

If the problem didn't exist, and now it does, something happened. I've seen upper bearing shells beat up to the point they just fall out of the rod.

Fly poop on spark plugs? Fuel change? Verify timing and TDC marks? Try another known good timing light?

Just reaching here.

Billy Nees · 08-24-2021, 11:29 AM

Quote:

Originally Posted by CMcAllister

Fly poop on spark plugs? Fuel change? Verify timing and TDC marks? Try another known good timing light?

Just reaching here.

or cam change too!

Larry Hill · 08-24-2021, 12:32 PM

First noticed it when we started getting close to the 590 hp number. Damper is on TDC, fuel seems to make no difference c11, c12, c10, renegade 116. cam changed made no difference.

Rich Biebel · 08-24-2021, 02:00 PM

If the engine is apart and obviously it is....

Look at the ring lands and the tops of the pistons for any oddball signs that usually indicate detonation. Pecker tracks on pistons, or on the sides of the pistons above the rings. Ring lands beat up....

If all is clean then you can rule it out....

It's not likely but I thought I'd throw it out there.

Frank Castros · 08-24-2021, 02:08 PM

Just thinking out of the box, how old is the Harmonic Balancer?

Larry Hill · 08-24-2021, 08:05 PM

At least 6 to 8 years old. Last time it was down I had crank checked for balance it was ok

dragracerray · 08-25-2021, 08:38 AM

What brand of balancer are you using?

Ralph A Powell · 08-25-2021, 09:46 AM

A good read on honing the big end of steel rods is in the SA Design Jenkins small block Chevy book I’d how he puts .002 shim stock the hens the rods round then removes it. The rod is now out of round but high rpm it stretch’s back round as I remember it’s when the rod does not have enough material at the parting line.

08-24-2021, 07:37 AM	#21
Larry Hill Live Reporter Join Date: Oct 2004 Location: Hickory, Ky Posts: 10,328 Likes: 1,679 Liked 9,623 Times in 1,996 Posts	Re: Micro Welding of bearing shell to rod housing bore The caps have dowels and the mating surface looks perfect. The upper shell is always not as tight as the cap shell in its bore. Is there a certain finish that the bore needs to “hold” the bearings? __________________ IHM Used Parts https://ihmusedparts.com 888-821-1817

08-24-2021, 08:18 AM	#22
Rich Biebel VIP Member Join Date: Jun 2007 Location: Northern New Jersey suburbs Posts: 2,275 Likes: 25 Liked 510 Times in 200 Posts	Re: Micro Welding of bearing shell to rod housing bore I've been reading this thread and wondered why no one mentioned detonation as being a possible issue. It can show up in rod bearings.... Usually the shells just fall out....and might have some odd looking wear marks.... __________________ Rich Biebel S/C 1479

08-24-2021, 12:32 PM	#25
Larry Hill Live Reporter Join Date: Oct 2004 Location: Hickory, Ky Posts: 10,328 Likes: 1,679 Liked 9,623 Times in 1,996 Posts	Re: Micro Welding of bearing shell to rod housing bore First noticed it when we started getting close to the 590 hp number. Damper is on TDC, fuel seems to make no difference c11, c12, c10, renegade 116. cam changed made no difference. __________________ IHM Used Parts https://ihmusedparts.com 888-821-1817

08-24-2021, 02:00 PM	#26
Rich Biebel VIP Member Join Date: Jun 2007 Location: Northern New Jersey suburbs Posts: 2,275 Likes: 25 Liked 510 Times in 200 Posts	Re: Micro Welding of bearing shell to rod housing bore If the engine is apart and obviously it is.... Look at the ring lands and the tops of the pistons for any oddball signs that usually indicate detonation. Pecker tracks on pistons, or on the sides of the pistons above the rings. Ring lands beat up.... If all is clean then you can rule it out.... It's not likely but I thought I'd throw it out there. __________________ Rich Biebel S/C 1479

08-24-2021, 02:08 PM	#27
Frank Castros VIP Member Join Date: Nov 2001 Location: The Lowcountry. Posts: 2,670 Likes: 2,181 Liked 2,164 Times in 789 Posts	Re: Micro Welding of bearing shell to rod housing bore Just thinking out of the box, how old is the Harmonic Balancer?

08-24-2021, 08:05 PM	#28
Larry Hill Live Reporter Join Date: Oct 2004 Location: Hickory, Ky Posts: 10,328 Likes: 1,679 Liked 9,623 Times in 1,996 Posts	Re: Micro Welding of bearing shell to rod housing bore At least 6 to 8 years old. Last time it was down I had crank checked for balance it was ok __________________ IHM Used Parts https://ihmusedparts.com 888-821-1817

08-25-2021, 08:38 AM	#29
dragracerray Member Join Date: May 2017 Location: Webster, New York Posts: 161 Likes: 323 Liked 127 Times in 60 Posts	Re: Micro Welding of bearing shell to rod housing bore What brand of balancer are you using? __________________ Ray Bassett I/SA 1687, SS/DA 1687 "SuperPro is both", unknown

08-25-2021, 09:46 AM	#30
Ralph A Powell Member Join Date: Oct 2017 Location: Bay City Texas Posts: 364 Likes: 1 Liked 204 Times in 125 Posts	Re: Micro Welding of bearing shell to rod housing bore A good read on honing the big end of steel rods is in the SA Design Jenkins small block Chevy book I’d how he puts .002 shim stock the hens the rods round then removes it. The rod is now out of round but high rpm it stretch’s back round as I remember it’s when the rod does not have enough material at the parting line.