Cross Bolt Mains
Thread Starter
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Mountain Pass
Joined: Feb 2004
Posts: 160
Likes: 18
From: NW Houston
Cross Bolt Mains
I was servicing my V10 the otherday. I did an oil change and a antifreeze change. I had a kid helping me. I told him to remove the plugs and drain the
coolent from the block.
He asked me why there was oil on the drain plug. I crawled under and he had pulled one of the side bolts to the cross bolted mains.
What would be the recommended procedure to fix this. I do not think the dowel pin dropped. There was no noise. The bolt went back in with no interferance and I retorqued it. I did not do the 90 degree second phase torque.
Do you think I need to get another bolt and torque it as in the manual or is it just fine as it is. I torqued it to 30 lb
coolent from the block.
He asked me why there was oil on the drain plug. I crawled under and he had pulled one of the side bolts to the cross bolted mains.
What would be the recommended procedure to fix this. I do not think the dowel pin dropped. There was no noise. The bolt went back in with no interferance and I retorqued it. I did not do the 90 degree second phase torque.
Do you think I need to get another bolt and torque it as in the manual or is it just fine as it is. I torqued it to 30 lb
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 423
From: Long Island USA
I'd get a BRAND NEW bolt and make sure it's torqued correctly.
It might be OK, but with these things going up to 200K without problems, why risk it all for just one stupid bolt?
Thing is, these bolts are torque-to-yield, and get a stretch to them. If you re-use them, you don't get the proper stretch, and if anything moves slightly, there won't be enough elasticity left in the bolt to keep bad things from happening.
I'd make sure it's a new bolt... but that's just me.
It might be OK, but with these things going up to 200K without problems, why risk it all for just one stupid bolt?
Thing is, these bolts are torque-to-yield, and get a stretch to them. If you re-use them, you don't get the proper stretch, and if anything moves slightly, there won't be enough elasticity left in the bolt to keep bad things from happening.
I'd make sure it's a new bolt... but that's just me.
Posting Guru
Joined: Mar 2002
Posts: 2,245
Likes: 16
From: Vancouver Wash USA
Originally Posted by krewat
I'd get a BRAND NEW bolt and make sure it's torqued correctly.
It might be OK, but with these things going up to 200K without problems, why risk it all for just one stupid bolt?
Thing is, these bolts are torque-to-yield, and get a stretch to them. If you re-use them, you don't get the proper stretch, and if anything moves slightly, there won't be enough elasticity left in the bolt to keep bad things from happening.
I'd make sure it's a new bolt... but that's just me.
It might be OK, but with these things going up to 200K without problems, why risk it all for just one stupid bolt?
Thing is, these bolts are torque-to-yield, and get a stretch to them. If you re-use them, you don't get the proper stretch, and if anything moves slightly, there won't be enough elasticity left in the bolt to keep bad things from happening.
I'd make sure it's a new bolt... but that's just me.
Thread Starter
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Mountain Pass
Joined: Feb 2004
Posts: 160
Likes: 18
From: NW Houston
Only 200,000. I already have over half of that!.
I am hoping for at least 300,000.
I will look into getting a new bolt. I am a little concerned about the dowel pin falling out. Hopefuly it is held in tight by the origional tourqing.
This is the first engine I have owned that was crossed bolted. What is the thinking behind that. I have worked on 454, 460, 390 and 360 engines that only had two bolts per main.
I am hoping for at least 300,000.
I will look into getting a new bolt. I am a little concerned about the dowel pin falling out. Hopefuly it is held in tight by the origional tourqing.
This is the first engine I have owned that was crossed bolted. What is the thinking behind that. I have worked on 454, 460, 390 and 360 engines that only had two bolts per main.
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Posting Guru
Joined: Mar 2002
Posts: 2,245
Likes: 16
From: Vancouver Wash USA
Originally Posted by tmehrkam
Only 200,000. I already have over half of that!.
I am hoping for at least 300,000.
I will look into getting a new bolt. I am a little concerned about the dowel pin falling out. Hopefuly it is held in tight by the origional tourqing.
This is the first engine I have owned that was crossed bolted. What is the thinking behind that. I have worked on 454, 460, 390 and 360 engines that only had two bolts per main.
I am hoping for at least 300,000.
I will look into getting a new bolt. I am a little concerned about the dowel pin falling out. Hopefuly it is held in tight by the origional tourqing.
This is the first engine I have owned that was crossed bolted. What is the thinking behind that. I have worked on 454, 460, 390 and 360 engines that only had two bolts per main.
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Elder User
Joined: Mar 2005
Posts: 735
Likes: 1
From: SW Iowa
tmehrkan a dumb question
You said you asked a kid helping you to pull the block plug and drain the coolant, and after checking, you found he had pulled one of the side bolts to the cross bolted mains.
My question is didn't he have to drop the oil pan to get to a main bearing cap bolt? Or am I misunderstanding what 'cap' bolt you are refering to.
My question is didn't he have to drop the oil pan to get to a main bearing cap bolt? Or am I misunderstanding what 'cap' bolt you are refering to.
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 423
From: Long Island USA
Originally Posted by 4wd
My question is didn't he have to drop the oil pan to get to a main bearing cap bolt? Or am I misunderstanding what 'cap' bolt you are refering to.
Maybe that's why these things last so long ...
ok, ty for the info
Senior User
Joined: Oct 2005
Posts: 127
Likes: 0
From: Crystal Lake, IL
The cross bolted main caps prevent a phenomenon called main cap walk. It is characteristic of many high powered 2 bolt main engines. Especially engines with relatively long strokes. The main caps wobble back and forth under high load. When I say wobble, it is a very small movement, but it can wreak havoc to your bottom end. It's a great thing that ford included this in the triton v10. This is a very strong attribute to this engine. Now if they could only have put some decent connecting rods in.
Last edited by SuperdutyRob; Nov 17, 2005 at 11:14 PM. Reason: spelling
