rebuild or replace?
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Freshman User
Joined: Aug 2014
Posts: 46
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rebuild or replace?
the power plant in my 90 Bronco died at the tender age of 330,000km due to a melted piston. the motor is out on a stand stripped down to the block pistons and crank still installed. Now my question to you all; should i rebuild my high mileage block? or just find a lower mileage one to drop in? if rebuild is the better choice how difficult are they to rebuild?
thanks y'all!
thanks y'all!
Elder User
Joined: Sep 2014
Posts: 549
Likes: 0
From: Ashland
the power plant in my 90 Bronco died at the tender age of 330,000km due to a melted piston. the motor is out on a stand stripped down to the block pistons and crank still installed. Now my question to you all; should i rebuild my high mileage block? or just find a lower mileage one to drop in? if rebuild is the better choice how difficult are they to rebuild?
thanks y'all!
thanks y'all!
What cause the piston melt?
Logistics Pro
Joined: Mar 2005
Posts: 4,698
Likes: 47
From: Mexico, Missouri
I'd rebuild!
I wonder if #8 piston is the melted one since the old PCV valve is located at the back of the plenum and all the trash gets sucked into the #8 runner. This was changed later around '94 to the center of the plenum due to the high number of blown/melted pistons on the #8 cylinder.
I wonder if #8 piston is the melted one since the old PCV valve is located at the back of the plenum and all the trash gets sucked into the #8 runner. This was changed later around '94 to the center of the plenum due to the high number of blown/melted pistons on the #8 cylinder.
Elder User
Joined: Mar 2013
Posts: 847
Likes: 4
From: In my house..
buy a short block and rebuild or replace the heads, rebuilt short blocks are aplenty and you can probably find a pretty good deal on one already assembled and it might even have some HP parts in it, check on craigslist and local machine shops..
Rebuilding your own stuff is a pain in the **** and really should be done only when you don't have a better/less expensive/pre-made option..
Rebuilding your own stuff is a pain in the **** and really should be done only when you don't have a better/less expensive/pre-made option..
Freshman User
Joined: Dec 2014
Posts: 45
Likes: 0
the power plant in my 90 Bronco died at the tender age of 330,000km due to a melted piston. the motor is out on a stand stripped down to the block pistons and crank still installed. Now my question to you all; should i rebuild my high mileage block? or just find a lower mileage one to drop in? if rebuild is the better choice how difficult are they to rebuild?
thanks y'all!
thanks y'all!
330.000 kilometers is about 165.000k miles right?
rebuild what you have unless you're cylinder wall is nicked to hell you're fine if it is get a new block. nothing wrong with your used block.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
If you want your truck back on the road ASAP for the least amount of money go find a complete low milage replacemernt motor to swap in, any 5.0 truck motor is a direct replacement and a '94+ would give you a power jump. You can then rebuild your original motor or junk it.. just be aware it will cost you every bit of $1500 to rebuild it right and you could possibly score a replacement motor for half that or better.
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