Engine break down hunt
Thread Starter
|
Lead Driver
Joined: Mar 2008
Posts: 7,188
Likes: 384
From: Near Los Angeles
Engine break down hunt
Some of you remember my first engine and how the oil psi dropped to 3 psi within 1k miles before I pulled it.
Well, I think the wound is sufficiently healed for me to address it. I want to start pulling apart the short block to search for the problem. Besides checking the rod and main journals, the rods visually, is there any thing else I should be looking for that could explain the falling oil psi?
When I built this one, I did not have the block, crank, or rods magnafluxed. Also, there was an alignment problem with the second cam journal. I had to ever so carefully 'sand' the bearing to get the cam in.
Any help is appreciated.
Well, I think the wound is sufficiently healed for me to address it. I want to start pulling apart the short block to search for the problem. Besides checking the rod and main journals, the rods visually, is there any thing else I should be looking for that could explain the falling oil psi?
When I built this one, I did not have the block, crank, or rods magnafluxed. Also, there was an alignment problem with the second cam journal. I had to ever so carefully 'sand' the bearing to get the cam in.
Any help is appreciated.
Thread Starter
|
Lead Driver
Joined: Mar 2008
Posts: 7,188
Likes: 384
From: Near Los Angeles
I'll break it all down. The cam is out and the c. bearings look perfect, holes lining up too. When I have it all stripped, I'll go over the block carefully, and take it and the crank and the rods to have them magnafluxed.
I just want/need to find out what happened.
I just want/need to find out what happened.
Thread Starter
|
Lead Driver
Joined: Mar 2008
Posts: 7,188
Likes: 384
From: Near Los Angeles
Thread Starter
|
Lead Driver
Joined: Mar 2008
Posts: 7,188
Likes: 384
From: Near Los Angeles
When I changed the bearings, I went with a hv oil pump too.
Trending Topics
Fleet Mechanic
Joined: Jan 2011
Posts: 1,479
Likes: 0
From: West Valley City
Did you put the gasket between the pick up and the pump, and the pump and the block? proper torquing and sequence could cause loss of oil pressure too.
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
Senior User
Joined: Nov 2005
Posts: 457
Likes: 0
From: Lathrop, MO
This is a bit of a painful subject. It's been about 2 years since the problem. When the psi dropped considerably, I pulled the pan and checked the bearings. They were thrashed after only IIRC 700-1000 miles. Something went through the oil. I replaced them, and for a short time it helped, but then the psi continued to drop. I remember getting 25 psi on the freeway! Checked the bearings again, and they were fine. They all look fine now.
When I changed the bearings, I went with a hv oil pump too.
When I changed the bearings, I went with a hv oil pump too.
I suspect that you've got something obstructing the oil journals. An ultrasound of the stripped block 'might' find.
My best advise is to take to a shop with a sonic cleaning tank. Then coble a means of testing the oil journals for flow.
I have no doubt you've already come to this conclusion.
Posting Guru
Joined: Mar 2006
Posts: 1,182
Likes: 1
this info won't be of any use, since your cam bearings are good, but to share in the pain and maybe give you ideas of where else to look for the trouble...
on the only engine rebuild i've done, a very slightly warped cam ate the cam bearings during the break-in. the oil was silver. the cam was brand new...i'd have never thought you needed to get it checked for straightness.
on the only engine rebuild i've done, a very slightly warped cam ate the cam bearings during the break-in. the oil was silver. the cam was brand new...i'd have never thought you needed to get it checked for straightness.
Thread Starter
|
Lead Driver
Joined: Mar 2008
Posts: 7,188
Likes: 384
From: Near Los Angeles
I fully understand it being a painful subject.
I suspect that you've got something obstructing the oil journals. An ultrasound of the stripped block 'might' find.
My best advise is to take to a shop with a sonic cleaning tank. Then coble a means of testing the oil journals for flow.
I have no doubt you've already come to this conclusion.
I suspect that you've got something obstructing the oil journals. An ultrasound of the stripped block 'might' find.
My best advise is to take to a shop with a sonic cleaning tank. Then coble a means of testing the oil journals for flow.
I have no doubt you've already come to this conclusion.
A crack, on the other hand, might explain my symptoms.
Thread
Thread Starter
Forum
Replies
Last Post
