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Possible Engine Build for my 93 Truck

I assume the WP backing plate is the same between the two timing covers. Wish I could rebuild the WP! the one on this engine is a GM pump and feels fine rotating by hand, but I know the seals .... it's sat up for a long time. I will have a sleu of parts I want to sand blast and clean up. v belt pulleys and all. might even try to rebuild the A6 compressor that was on it since that is the style on this engine and I seem to recall they are almost indestructible compared to the R4 pancake ones. I will have to modify the hoses or get the correct suction/discharge hose. PS pump will be need to be swapped though since mine uses the o-ring metric fittings. My son needs a pump too for his power steering conversion so if I just swap the housings around he will have the pump with the flared fittings for his truck, I will just need to get him a double V pulley
 
I placed an order for the lapping tools, compound and some assembly lube so I can start work on the heads this weekend. watched a few youtube videos on doing the valves and I see they all seem to be using some assembly lube on the stems during the process. I will need some anyway depending on if I need to do mains and rod bearings.
 
LOL I had just found my carbide bit for the drimmel tool the other day! I can go through them and remove all of the flashing. I need to finish disassembly on all of the valves and then do another round of washing. there is a bunch of carbon and gunk under the valves in the ports yet. i think I will be using some gasoline this time around. we have about 15 gallons that we drained from my son's truck to clean the tank.
 
That looks like a speed sensor on top of the oil pump drive. same type of reed switch sensor as what my son's truck has on the trans.

the wheel inside has a 4 pole magnet which will close the contacts in the reed switch 4 times per revolution. having it on the oil pump drive would make it act like a engine speed sensor

That has got to be aftermarket. the sensor if that is what this is, is from Howell EFI

Here is a pic of it when I replaced the reed switch inside it.
1776917751785.png

Here is a pic of one open with the magnetic wheel.

1776918781473.png
 
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Well folks.... Bad news brown! I spend some time this evening dissembling both heads and giving them a gasoline bath to get the remaining sludge out. started inspecting all everything and well, they both have some issues. the worst is the #6 intake seat is really fubar. I have not inspected the valve yet. I also found some hair line cracks between the valve seats on #2, #8, #1, and #7. I think I could run them with the hare line cracks, but that valve seat is done.


Here is the #6 intake valve seat
IMG_1382.jpg

#2 small crack in between the valves
IMG_1383.jpg

#4
IMG_1384.jpg

#6
IMG_1385.jpg

#8 cracked in between the valves
IMG_1386.jpg

#1 cracked in between the valves That stuff above the crack is some carbon I didn't knock off.
IMG_1387.jpg

#3
IMG_1388.jpg

#5
IMG_1389.jpg

#7 I think it also is cracked in between the valves
IMG_1390.jpg
 
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I would have tried to lap #6 and run it only seeing the one area of the seat that was thin, but after finding the other spot that is completely fubar, it's toast!

@Will L. maybe this constitutes for a vote for some carnage!

I have one other option and that's pulling the heads off this other 6.2 and see the condition of those heads. if not, then it would be to try and use the heads that are on the 6.5 in my 93. the 93 runs fine other than the perfuse blow by, but idk if a bad head can cause blow by. I also know it chewed on some GP tips at some point in it's life too, so there's that.

What say you guys?
 
While I was at it with the gasoline bathing, I pulled the lifters and hardware and cleaned up all of the rockers, push rods, and lifters so I could inspect them.

curious if the lifters can go into the ultrasonic cleaner. if they can, what should I use in it? I would assume nothing that's water base, maybe diesel or some paint thinner?

I also need to order one of those oil squirt cans so I can pump oil into them and then let them all sit submerged in some oil for when they get installed.
 
ak diesel driver said:
I'd disassemble them to clean them. too much risk of getting stuff inside them
Click to expand...
I have never disassembled lifters! I know there is a keeper on the top but I always thought just the cup that holds the push rod comes out, the rest was all machined together.

are there any seals/o-rings inside them or small metal pieces like a miniature piston ring that would deturr me from wanting to pull them apart?

I will most likely be tearing the heads off the other 6.2 tomorrow to see how they look. I am hoping they aren't as sludged up and will clean up easier for me to inspect
 
Then again if that fails then I will plan on using the heads on the 6.5 that's in the 93. it runs and doesn't "mysteriously" loos coolant, it leaks coolant LOL I would assume that I could lap the valves and run them as is and still come out with a "better" worn out engine.
 
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