8BA teardowm

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Mar 30, 2022 | 11:38 PM

#31

ALBUQ F-1

Fleet Owner

Joined: Jul 2004

Posts: 27,294

Likes: 1,055

From: NM

Quote:

Originally Posted by 52 4x4

PP is pressure plate (bolts). I'm wondering if it has an 11" pressure plate and a 10" clutch disc? The flywheel surface has a "funny" look to it. - Bob

The flywheel appears to me to be drilled for a 10" PP, but you're right about the wear area being awfully close to the bolts. 11" disc with 10" PP? Here is my flywheel, drilled for 10" PP. An 11" drilling is almost on the edge.

Flywheel drilled for 10" PP

This is a poor pic but shows the wear area for a 10" PP with 10" disc, relative to the PP bolt holes

Mar 31, 2022 | 12:08 AM

#32

tip49

Thread Starter

Cargo Master

Joined: Sep 2004

Posts: 2,757

Likes: 138

From: Alberta Canada

You guys are very observant.
I did keep the pressure plate and clutch for now. I pulled the water pumps today. Took me quite a while to figure out the hidden bolt inside the housing at the top. I kept all the bolts from disassembly.
Thanks for the suggestions.

Mar 31, 2022 | 07:30 PM

#33

tip49

Thread Starter

Cargo Master

Joined: Sep 2004

Posts: 2,757

Likes: 138

From: Alberta Canada

11" pressure plate

The preesure plate measures out at 11 inches in diameter.
All salvaged parts are degreased, except oil pan. I rust treated them and will spritz them all with WD40 before storing them.
On to the next carcass.

Apr 1, 2022 | 09:02 AM

#34

tinman52

Welder User

Joined: Feb 2009

Posts: 5,269

Likes: 50

From: northwest MT

Tom, I may have a usable 8ba block here if you can't find anything closer

Apr 2, 2022 | 02:01 PM

#35

tip49

Thread Starter

Cargo Master

Joined: Sep 2004

Posts: 2,757

Likes: 138

From: Alberta Canada

Salvage pile

All I kept including bolts, from the teardown.

Apr 2, 2022 | 05:19 PM

#36

ALBUQ F-1

Fleet Owner

Joined: Jul 2004

Posts: 27,294

Likes: 1,055

From: NM

Good job!

Apr 3, 2022 | 12:21 PM

#37

1952henry

Cargo Master

Joined: Jan 2004

Posts: 2,196

Likes: 351

From: Mandan, ND

If you care to look, I would be curious as to the part number on exhaust manifolds, including letter prefix, especially.

Apr 3, 2022 | 01:03 PM

#38

bmoran4

Parts Nerd Extraordinaire

Joined: Sep 2010

Posts: 4,366

Likes: 1,784

From: Western NY

Those headers look to be "truck" manifolds and can be 7RT-9430/1 or 21A-9430/1. Antidotal evidence leads some to believe that some our trucks came from the factory with 7RT-9430 on the right and a 21A-9431 on the left.

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Apr 3, 2022 | 02:04 PM

#39

tip49

Thread Starter

Cargo Master

Joined: Sep 2004

Posts: 2,757

Likes: 138

From: Alberta Canada

Exhaust manifold part#'s

Quote:

Originally Posted by 1952henry

If you care to look, I would be curious as to the part number on exhaust manifolds, including letter prefix, especially.

i will look today, and post them later.

Edit:
Driver side = RT 9431
Pass side = 7RT 9430

These are off a Canadian made 3/4 ton truck

Apr 3, 2022 | 07:15 PM

#40

tip49

Thread Starter

Cargo Master

Joined: Sep 2004

Posts: 2,757

Likes: 138

From: Alberta Canada

Quote:

Originally Posted by 1952henry

If you care to look, I would be curious as to the part number on exhaust manifolds, including letter prefix, especially.

It seems these manifolds are RT prefex designation.

Apr 3, 2022 | 08:07 PM

#41

3twinridges

Cargo Master

Joined: Nov 2014

Posts: 2,442

Likes: 256

Those manifolds look great. Shame about the block though, I wonder how a hole that big in the cylinder developed?

JB

Apr 3, 2022 | 09:00 PM

#42

ALBUQ F-1

Fleet Owner

Joined: Jul 2004

Posts: 27,294

Likes: 1,055

From: NM

I'd assume there is just a casting flaw that obscures the "7" on the manifolds.

Apr 3, 2022 | 10:08 PM

#43

tip49

Thread Starter

Cargo Master

Joined: Sep 2004

Posts: 2,757

Likes: 138

From: Alberta Canada

There's a hole in the bucket dear Liza

Quote:

Originally Posted by 3twinridges

Those manifolds look great. Shame about the block though, I wonder how a hole that big in the cylinder developed?

JB

I was wondering if water sat above the piston and froze in the cylinder? It is only in the one cylinder that I could tell. I didn't look that hard after finding the first one.

Apr 4, 2022 | 07:03 AM

#44

1952henry

Cargo Master

Joined: Jan 2004

Posts: 2,196

Likes: 351

From: Mandan, ND

Thanks for the info on manifolds. The original (cracked) engine in my 52 MH had the 7RT and 21A manifolds. Bought a pair at a swap meet, same thing. Bought a 25,000 mile running pickup for parts. This engine has mismatched manifolds as well. It has a replacement carb and fuel pump, but standard pistons and bearings. I doubt the manifolds were molested. Thinking that is how some came.