COLLAPSED PISTON

[1980_Cj7]

Sure seems like they were in a hurry when they were rebuilding your 401

I don't know how much actual time they spent on the engine, but the sad part is it took them forever to get it done. Caused us to miss the big PA Jeeps Show which is one of the highlights of our Summers for one thing.

Depends on how they treat us from here as to how much "publicity" we'll give them.

[Mudrat]

Show'm this thread and then play "Let's make a deal"

[1980_Cj7]

Just for kicks, I ran the CR calculator again using .040 over KB354 pistons with the Clevite cam we have. I adjusted the intake closing to the actual of 72 degrees ABC. Doesn't look too bad if I've done everything correctly. What do you think?

Again, our desire is to get as much power as we can out of pump gas.

ENTER YOUR DATA CALCULATED DATA
Cylinder Head Volume (cc) 58
Cylinder Head Vol (cubic in.) 03.538
Piston Head Volume (cc) 28
Piston Head Vol (cubic in.) 01.708
Gasket Thickness (in.) .045
Swept Volume (cubic in.) 51.106
Gasket Bore (in.) 4.275
T.D.C. Volume (cubic in.) 05.892
Cylinder Bore Diameter (in.) 4.205
Gasket Volume (cubic in.) 00.646
Deck Clearance (in.) 0
Note: Neg. number above deck, Pos. number below deck
Deck Volume(cubic in.) 00.000
Stroke (in.) 3.68
STATIC COMPRESSION RATIO 09.674

OPTIONAL DATA
Rod Length (in.) 5.858 Adjusted Stroke (in.) 02.676
Intake Closing Point (degrees) 72
(actual calculated from advertised duration of 294 degrees)
DYNAMIC EFFECTIVE COMPRESSION RATIO 07.308

Now, the big question is how far off was the cam when it was installed incorrectly, and how much of our problems was it causing. Maybe we should put a degree wheel on it with it installed the way it was and see what was happening, then degree it again installed correctly and see what that gives.

[Blown7]

Now, the big question is how far off was the cam when it was installed incorrectly, and how much of our problems was it causing. Maybe we should put a degree wheel on it with it installed the way it was and see what was happening, then degree it again installed correctly and see what that gives.

At this point I would worry about just getting the engine built correctly this time or you won't make next years PA Jeep shows. Time enough ahead to degree the cam properly.

Jeff

[1980_Cj7]

Jeff, I hear you. What I was getting at is we're trying to decide whether to use the same cam next time around or get a different one. We're trying to figure out if the problems were from the cam grind we had, or from it being installed incorrectly.

[fuzz401]

from it being installed incorrectly

[Goose]

I agree, the problem from having the cam out of whck like that.. (frankly I am amazed it ran..)

[1980_Cj7]

Was just reading about the cam anti-walk kit in the sticky post on distributor gears. Would it be a good idea to install one on our re-rebuild? We have a hydraulic cam that has about 300 miles on it. Will it hurt to install the anti-walk kit on a used cam? I was thinking it might change the wear pattern between the lifters and cam.

I also want to check and make sure the front cam bearing has the groove, and the cam has the oil relief holes in the back end. Wasn't aware of these things the first time around and consequently didn't check them.

[Mudrat]

Was just reading about the cam anti-walk kit in the sticky post on distributor gears. Would it be a good idea to install one on our re-rebuild?

300 broke-back miles? Or is this a different cam

[1980_Cj7]

I spoke with the owner of the butcher shop - UCF MACHINE SHOP IN CARLISLE, PA and he is refusing to pay for another shop to correct and redo the motor correctly. He said that he would redo the motor and fix it at no cost himself.

I do not under any circumstances want these jokers working on my motor anymore. Does anyone know what kind of legal rights I may have? He indeed agrees that they messed it up and that it should be corrected, however he does not agree on the fact that I would like to select the new doctor.

He said "didn't I ever make a mistake?" I replied, yes, everybody makes mistakes and has bad days, but, it was more that one thing you screwed up: 1) cam installed wrong, 2) timing gear installed wrong and no oil getting to the timing chain, distributor gears, fuel pump eccentric, etc., 3) pistons installed .017" down the holes, 4) brand new rod bearings look like they have 100,000 miles on them already, and who knows what else we'll find when we continue tearing the engine apart. Plus, I'm sure if he redid the engine, we'd end up at least .040 over. The new engine shop said they'd take just the bare minimum to clean up the cylinders, then we could order custom pistons to fit.

The other thing is when we took the engine back to these clowns when it first started acting up, they looked at it and said they had no idea what was wrong. Even when we then tore the pistons out and showed them to them, they said they never saw anything like that and didn't know what would cause it.

Advertising isn't cheap, but I think these birds are gonna get some real cheap advertising...only not the kind I think they want!