I do one of those kind of jobs at least once a month. People dont realize how much work it is to get things torn down like that. I enjoy it most of the time, but I prefer nice clean electrical work....lol

 

Hiioooh, Silver

Thank you for posting the photos, and sorry for your misfortune.

That failure is hopefully an anomaly. I'm going to have a look at some 4.0 heads to see if it could have been caused by a blocked oil passage, but I don't know for sure if the4.2 heads are the same.Otherwise, either the cam bearing caps had been incorrectly interchanged...or the cam journal saddles were not properly line bored when the head was originally machined.

The latter is what happened with Series III 4.2 blocks, I built dozens that burned up rear main bearings because the saddle diameter was too small. With that failure, the problem only became obvious when the seal burned up and leaked...often times thattook a while before enough damage was done.

Point being, if your head was improperly line bored, there will be others. Anybody have another explanation of silver's siezed camshaft? Hard to figure that this engine is just a lone ranger.

Fight them to the death for a factory rebuilt motor...even if you have to wear the mask when you do it.

 

Blocked oil passage possibly. My money is on the bore diameter. Friday car LOL

 

Greetings Factory,

I'd bet on the tight clearance too. Let's just hope it was only one Friday! It's a little bit amazing to methat one of those morse chains could break, they look stronger than snot. Even the 4.0 primary chains never break.What with the cam being hollow, I'd have guessed it would have twisted off at the front journal. Great to see the pics, though I'd love to see the numbers on the cam caps...

 

Yeah I know what you mean, however with that damage, would be impossible to get accurate measurements.
No matter how strong the chain, that gear is unbelievably resilient to damage. How many 4.0 have you seen secondary chain snap and never damage the exhaust cam gear? I had one last week that actually blew out the top of the cam cover, snapped the coil cover on the way, and jammed up in the exhaust cam gear. Not even a chipped tooth.
I wish the chains were the same length, I would put them on my VDP.
We have had 3 4.2 X350 in 6 months roughly that the secondary tensioners fell apart on, but never saw the chain come apart like that. Makes me want to vomit....lol

 

Thanks FJT, I was wondering if gen 3 secondary tensioners would eventually start showing up as "destructable". I was still thinking of using 50K miles as a recommended replacement interval. Overkill, or prudent insurance?

 

I would say if the customer is planning on keeping the car, do the tensioners and probably the secondary chain too. However, this car had its own issues different from the average cat.
We will see.....we are a big dealer and I think total we have seen 5 tensioner failures and 3 4.2 engine failures. Pretty good going considering 4.2 has been out now 5 years.

 

Thanks for that, I can't get that sort of up to date information anywhere else. Sometimes I start to feel like Gilligan, stranded on "Independant's Island".

 

LOL. I help out the independant guys down here alot. One day they will be able to help me with something I am sure. We are all in the same game, just paid by a different company.

 

i miss a good old tear down like that.. still havent had a 4.2 tensioner failure up here. there running gggggreat

 

I wonder if again.....it is climate related?

 

keeps us employed lol

 

How can something like this be prevented?

Would synthetic oil be better than conventional?

 

Get a load of this ... Ford ESP, the extended warranty company, is denying the claim because they believe that selling dealer falsified the warranty paperwork and/or didn't process it properly. And now everyone is pointing the finger at each other and the car is collecting dust.

 

sounds like a load all right.. ford is usually good with there ESP. i wud say it's the dealers fault.. id get on there ***.

 

Indeed. I would take the estimate to the selling dealer and tell them they are going to eat it. Not your fault. If dealer truly falsified documents or didn't file it, they are liable either way. Make sure you keep all paperwork adn only give selling dealer copies.

 

keep us posted

 

Well, here's the latest.

After draining the oil and dropping the oil pan the Jag dealer has determined the engine is beyond repair. They've provided an estimate to replace it for $12,250 with a Jaguar reman engine.

The selling dealer is begging and pleading with Ford to accept the corrected paperwork and honor the claim. They "swear" they will get it done. I have little confidence they will. The paperwork is pretty messed up and they've now given Ford 3 different mileage readings for the car which has only complicated it more.

So unfortunately I've got a call into my attorney to see if he can't straighten it out.

In the meantime the Jag dealer wants his lift back so I need to quickly decide if I want to pay them to partially put it back together and push it outside until this mess is straightened out or bite the bullet and have them start on it prior to determining how/who is paying for the repair. I owed them an answer yesterday.

 

Too bad if they wantthe lift back. Have them just roll it outside. Do not pay anything at this time. Have them call the selling dealer and get authorization to do whatever needs to be done. Worst case they will have to pay and get reimbursed. It is not your responsability to pay. The selling dealer was in error. Worst case tell selling dealer to tow it back to there place and give you another car.

 

or get all your money back.. i wud tell them to eat it.