Engine rebuild question
Thread Starter
|
Mountain Pass
Joined: Dec 2021
Posts: 169
Likes: 9
Engine rebuild question
Alright folks, looking for opinions. I have an 89 351w just back from the shop. Started putting together last week. Installed the crank and torqued the main caps in sequence to 100 ft/lb. Here’s the question….. the bolts were dry. Should I pull it back apart and oil the threads and retorque? Pistons are in, heads are bolted on with ARP bolts and used the arp lube on the head bolts. Thanks for sharing your thoughts. Just keep reading that the main bolts should have had a drop of oil on them before installing…..
Cargo Master
Joined: Nov 2009
Posts: 2,190
Likes: 620
You know, I'd have to look at some sort of actual specification, but I've always used motor oil on the threads of my Rod and Main bolts, when installing them. I don't know if it's something that's required, or just something I do because that's the way my Dad taught me to do it.
Cargo Master
Joined: Mar 2010
Posts: 3,339
Likes: 293
From: Laramie, WY
Oiled vs dry threads will impact the clamping force for a given torque applied, due to the frictional losses in the threads. Dry-dry will deliver less clamping force (more torque goes to friction) than oiled. That's why I was asking how dry they were. I think I'd pop the bolts out, oil, and reassemble too. The piece of mind would be worthwhile.
Hotshot
Joined: Nov 2017
Posts: 17,499
Likes: 2,773
From: Northern Ontario
You know, I'd have to look at some sort of actual specification, but I've always used motor oil on the threads of my Rod and Main bolts, when installing them. I don't know if it's something that's required, or just something I do because that's the way my Dad taught me to do it.
What would concern me is that you did not achieve the proper clamping load. Especially on main bearings. Ie. The hardware may be at torque, but not clamping down as they should be if done with lubrication.
Trending Topics
Thread Starter
|
Mountain Pass
Joined: Dec 2021
Posts: 169
Likes: 9
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
Logistics Pro
Joined: Aug 2014
Posts: 3,569
Likes: 853
I'm doing some heads, and was concerned about my bolts. If your pulling your end cap bolts, and they are used, you may want to check this video out:
Basically, using simple callipers, you can tell if you bolts are bad or good and will know if you need to replace or not:
Basically, using simple callipers, you can tell if you bolts are bad or good and will know if you need to replace or not:
Thread
Thread Starter
Forum
Replies
Last Post
nick83f150
Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W)
8
Jun 25, 2018 06:33 AM
imabass
Modular V10 (6.8l)
2
Jul 16, 2017 06:21 PM
76 F150 Ranger XLT
FE & FT Big Block V8 (332, 352, 360, 390, 406, 410, 427, 428)
4
Sep 15, 2004 12:53 PM