4.2 seized?
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Joined: Dec 2008
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4.2 seized?
Hi everyone,just bought a 1999 f 150 pretty cheap with a 4.2 motor that wont turn over,the guy i bought it from said he was driving down the road at 30 kmh when it just died.he took it to a garage and the mechanic took the belt off and tried to turn the crank and it wont budge,now i have been reading thru the other posts and cant find the same problem as i have,it is a hi mileage truck (300,000 km) any help would be great i am a mechanic by trade (heavy equipment) so i will be doing the work myself,thanks
Cargo Master
Joined: Aug 2002
Posts: 2,013
Likes: 6
From: Cajun Country
The 4.2 has never had head gasket issues.It is the lower intake gaskets that fail and allow coolant to fill the cylinder/cylinders,thus causing hydrolock!
Cargo Master
Joined: Apr 2001
Posts: 2,220
Likes: 26
There are plenty of threads on hydro-locking and the damage it causes.
Get a 2000 or later engine.
Since you know how to wrench, I suggest doing what I did and finding a used engine. I was able to find a used 2000 4.2 for 500 bucks from a wreck.
WARNING:
When removing the bad 4.2, take LOTS of digital pictures of the lines and wiring and external accessories. The 2000 engine I used had different injectors (at the harness connector) and other external parts than the 1997 I replaced. The parts swapped easily enough, but get a complete engine with harnesses if possible. If you pull the injectors don't knock off the plastic "tips", pull straight out. Use new O-rings when reinstalling.
It wasn't bad to remove. Gearwrenches are your friend so if you don't have a metric set this is a good excuse to get them.
Get a 2000 or later engine.
Since you know how to wrench, I suggest doing what I did and finding a used engine. I was able to find a used 2000 4.2 for 500 bucks from a wreck.
WARNING:
When removing the bad 4.2, take LOTS of digital pictures of the lines and wiring and external accessories. The 2000 engine I used had different injectors (at the harness connector) and other external parts than the 1997 I replaced. The parts swapped easily enough, but get a complete engine with harnesses if possible. If you pull the injectors don't knock off the plastic "tips", pull straight out. Use new O-rings when reinstalling.
It wasn't bad to remove. Gearwrenches are your friend so if you don't have a metric set this is a good excuse to get them.
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