4.2 Valvetrain problems ???
Thread Starter
|
Tuned
Joined: Jul 2006
Posts: 284
Likes: 6
From: Clover, SC
4.2 Valvetrain problems ???
Recently picked up a '97 F150 with a 4.2L V6 in it. The previous owner is reporting to me that it has some valvetrain problems. He says the Ford dealer told him that there are some plastic parts (the lifter retainers I assume) that have failed and caused the problem.
The engine will not start and run, however it tries to. It acts like it has jumped time and occasionally it will run briefly - when it does it sounds retarded and there is valvetrain noise.
Anyone else ever heard of this problem with these engines? I can't seem to find any records of it in a couple hours worth of online searches. This engine only has 104,000 miles on it. Its full of oil and coolant, etc.
I'll be tearing it down tomorrow probably, I just thought I'd ask on here if anyone else has had a similar problem with a 4.2. This will be my first intimate encounter with a 4.2.
The engine will not start and run, however it tries to. It acts like it has jumped time and occasionally it will run briefly - when it does it sounds retarded and there is valvetrain noise.
Anyone else ever heard of this problem with these engines? I can't seem to find any records of it in a couple hours worth of online searches. This engine only has 104,000 miles on it. Its full of oil and coolant, etc.
I'll be tearing it down tomorrow probably, I just thought I'd ask on here if anyone else has had a similar problem with a 4.2. This will be my first intimate encounter with a 4.2.
Thread Starter
|
Tuned
Joined: Jul 2006
Posts: 284
Likes: 6
From: Clover, SC
Welp - got into this thing a little bit today and discovered that it does NOT have any upper valvetrain issues. I suspected as much. There is evidence there has been some water in the crankcase though and #1 is down to about 60psi, all the rest are around 130psi. I figure it has a blown head gasket - and any "noise" its making must be a result of a spun bearing or seven....lol.
Thread Starter
|
Tuned
Joined: Jul 2006
Posts: 284
Likes: 6
From: Clover, SC
Welp, the intake gasket took this one out. Blew out into the #1 cyl intake port and bent the #1 connecting rod. The lower part of the piston was making contact with the crank counterweight at BDC - making the odd sound. The piston is broken as well.
I need one piston and connecting rod assembly for a '97 4.2 (I think they're all the same) Anyone got one laying around in a junk motor?
I'll post pictures later.
I need one piston and connecting rod assembly for a '97 4.2 (I think they're all the same) Anyone got one laying around in a junk motor?
I'll post pictures later.
Thread Starter
|
Tuned
Joined: Jul 2006
Posts: 284
Likes: 6
From: Clover, SC
Just a few pointers if you decide to pull this motor out of your truck...
It will help tremendously if you remove the belt driven accessories, the water pump and the crank pulley. I got mine out with all that stuff still bolted on, but it was a huge pain in the ***. If had removed all that stuff before I started the lift it woulda been about 10 times easier. As small as that engine looks down in the bay, you would think it would come right out without any issues...not the case. What's deceiving is the size of the 'hole' between the top of the radiator support and the leading edge of the windshield cowl. My truck is a 5-speed, so there was also a clutch/pressure plate there that added a couple inches of length. You need to be careful not to damage the intake runner actuators - I broke one of mine when it made contact with the leading edge of the windshield cowl. Those things are $75 a piece.
It will help tremendously if you remove the belt driven accessories, the water pump and the crank pulley. I got mine out with all that stuff still bolted on, but it was a huge pain in the ***. If had removed all that stuff before I started the lift it woulda been about 10 times easier. As small as that engine looks down in the bay, you would think it would come right out without any issues...not the case. What's deceiving is the size of the 'hole' between the top of the radiator support and the leading edge of the windshield cowl. My truck is a 5-speed, so there was also a clutch/pressure plate there that added a couple inches of length. You need to be careful not to damage the intake runner actuators - I broke one of mine when it made contact with the leading edge of the windshield cowl. Those things are $75 a piece.
Thread
Thread Starter
Forum
Replies
Last Post
