Ok, I recently purchased a 1988 F250 4wd 5 speed ZF and 460 EFI engine. Bought it not running, never expected internal engine problems like this. So anyways, compression test indicates 1 good cylinder. Pull valve covers, 7 bent intake push rods just my luck. Remove all the rocker arms and verified the 7 bent push rods also mean 7 bent intake valves. Obviously we had some piston to valve contact. No idea how this happened, my only guess when the old man passed away the son went mudding, broke it and parked it back in the barn.
So, my question is this. What are the chances the pistions survived and I can get by with some cylinder head work? I am unable to do any leakdown test because of the stuck open valves, but the engine only has 81000 miles on it and I am sure the bottom end is fine as long as the pistons survived the impact. I am just hoping to pick everyones brain untill I get the heads off sometime this week. Thanks

Steve

 

You will have to get the heads off and have a look.

 

The 88's had a 5 digit odometers so you really have some doubt there as to true mileage. Pop off the heads and have a look see. If damaged pistons, then you may have to assume that the rods are no longer square or within the out of round tolerance...good luck, I'm sure she will live again

 

Thanks for the reply guys. As far as the mileage, it is bonefied 81000 miles. I really thought this was a good buy with just bad fuel in the tanks from sitting for so long. I knew the man that owned this truck, have the original sales reciept and all maint history. This was his farm truck that he also used to take his cattle to the auction in. While he was alive this truck never went over 55 mph. Now what his son did to it in the 3 months after his father passed away no one knows, but he obviously had a good time in it.
Anyways, I should have the heads off this weekend. I will update this post when I get there.

 

Good morning, 70f100longbed. Today is the most important day of this whole challenge. I hope you and any and all gurus are available as I am time this thing today. I am a little concerned about the current result. I am following Video 4 of FordtechMakuloco timing chain replacement and his videos are great and nicely done but He rotated the crankshaft, marked it, removed roller followers and a lot of other stuff. I did none of this as I do not have the roller follower removal tool. Anyhow, I did as he suggested and rotated the crankshaft to 11 o'clock ( as close as possible) and installed the chain as suggested sprocket link on the mark and phaser links spanning the "L" ( Please see pictures below). All went well and the chain installed however the Sprocket mark is not perfectly at 6 o'clock?. Am I off a gear? It seems another gear rotation will be too much?. Also, I rotated the left side cam with the roller followers installed something Makuloco does not recommend. Any and all advice is greatly Appreciated!!

 

Yes the left side chain is rubbing at the top of the VVT bracket. Also the chain is not centered on the guide. it's like the phaser in stalled to deep on the cam but the pin prevents that so I don't understand how to adjust it. What if my end caps were reversed? would this do it. It's possible for as long as I have been working on this truck?

 

Also, there is no left or right side phaser correct?

 

The left side cam shaft (Drivers side) is the shorter one correct. When I put the phaser on the chain hits. I 'm stumped. Done for the day. Come get my truck it will be at the bottom of the Chesapeake Bay.

 

@70f100longbed, you are right and you nailed it. They do not line-up and there is no way the chain will go on with the shorter cam shaft on the drivers side. You can see this from the picture below: