Those in the know is this timing cover OK or do I need one note light scoring in oil pump gear area

Replacing pump gears, my oil light issue was probly the fact that all my main and rod bearings were down to the copper and scored guess my calibrated ear was hearing the beginning of bottom end failure, I could rattle the rods on crank, rings fell off the pistons no effort

Don't think the engine was gonna last much longer

 

The max dimension between rotors and cover plate is .004".

Normally folks get a new front cover, gears and cover plate. Not cheap. I doubt your front cover with cover plate and new gears will come in under that max dimension. Try it out, see what you get.

 

Not Dusty but yes. If you can weight a 4.0 piston against a 4.6. I'm wondering about them being a gram or two lighter to make up for the longer 4.0 rods. The dished centers are different cc's (can anyone verify) between the two hence the higher compression with the 4.0L slugs.

USN Ord - do you know how what the piston top to deck height was since you used the longer rods on a longer throw crank? That's almost a 1/4" difference between stock rod lengths. I don't know the journal center differences. Just wondering, I know your not getting pre det on regular but if a piston is too low you loose quench and too high obviously interferes with valves. I also don't have the pin center to piston top difference between the two slugs. Obviously it worked, just wondering for my own reference later on down the road.

 

Yes.
Piston dish volume: 4.0-litre, 13.23 cc. 4.6-litre, 22.29 cc.

4.0 has a stroke of 2.80" and a rod length of 6.105" for a total crankshaft CL to wrist pin CL of 8.905".

4.6 has a stroke of 3.232" and a rod length of 5.893" for a total length of 9.115".

 

Dusty if you ever need a life partner look me up........

So with 4.0 rods/pistons on 4.6 crank that adds up to a .222 difference, damn near a quarter inch higher at 9.337 on Old Navy's? 3.232 + 6.105 = 9.337....... what am I missing?

 

Gonna try to get short block together tommorow, so I need to use 4.6 crank and rods, which pistons? Is there an advantage to the higher compression?

guys am I measuring the oil pump clearance with plastigauge? Or just let it fly since I am using a new pump, scoring is not as bad as pics show, I can feel it some with finger nail in the aluminum front cover, that metal plate is smooth

 

Go with the 4.0's pistons and use a feeler gauge slipped in between the gear-rotors and mounted plate cover.

 

I'm missing something too... I didn't think that the 4.0 rod on the 4.6 crank would fit.
profile / dish compensation clearence? I will do some more measuring when I get to my shop.

 

Was wondering do you have to use oil cooler lines? Or can you just plug off the ports?

 

I doubt it, I think USnO used 4.6 rods otherwise the slugs would be a wee bit proud of the deck...... Now if you used aftermarket you could find a pin closer to the top like in a flat top but then you'd have one tiny chamber and it would probably eat composite hg's like Moon Pies at a Mobile Joe Cain Day Mardi Gras parade.