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84 B2000 Plastic/Rubber Inserts In Rocker Assembly???

962 Views 6 Replies 3 Participants Last post by  C_Ben
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Hello! This is my first post here.

My girlfriend and I are working on an 84 B2000 we bought cheap with a blown head gasket.
Luckily the head and block are both in good shape and measure nice and flat.

Unfortunately, the inside of the valve cover and the entire rocker assembly were both coated in a lot of sludge. Maybe coking? The head cleaned up nicely but now we're on to the rocker assembly.

I took the assembly apart and was surprised to find what seems to be very old brittle plastic (or rubber) ring inserts inside the ends of the rear rocker shafts. There seem to be three of them, each about 4 or 5mm thick (didn't actually measure), in each shaft. I tried to clean one and it just crumbled in my hand.

I know about the rubber o ring that goes on the center tube and is inset into the middle bearing cap but I have no idea what these other "inserts" would be for. I have seen no mention of them in either of our repair manuals or online.

Does anyone know anything about these inserts?

Sludge:
Automotive tire Wood Font Art Motor vehicle


Motor vehicle Font Gas Engineering Auto part



Nice and clean head:
Motor vehicle Gas Auto part Engineering Machine


Automotive engine gasket Audio equipment Gas Electronic instrument Auto part



Rocker assembly disassembled:
Font Art Tool Auto part Machine


Looks like I forgot to take any pictures of the inserts themselves but I can if that'd be helpful.

Thanks in advance for any help,

Sam
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Hey Sam... did you find something suitable for this? I can check my microfische catalog this weekend for an OE part number and get back to you if you have not. I see the aftermarket head gasket sets do not seem to include these. I do remember seeing these when I took apart my rocker shaft assemblies. Such a pain to do with only 2 hands sometimes. Where you from by the way? Was it the common external coolant leak? Where are you from? Are you going to keep the dual EGR system on the truck when you put it together?
Hey C_Ben......I have never messed with the 1st gen 2.0 engine, but if you could find and post that/those part numbers. I'm sure it will help others in the future. Thanks!
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Hey C_Ben! Thanks for your reply!

We did not find any suitable replacements for those inserts. They were not included in our Felpro gasket kit (although the O ring was). Nor were we able to find any info regarding them online. They also aren't mentioned in either the Mazda FSM or the Haynes manual we have (and both have exploded diagrams!). It's a bit of a mystery. Glad to hear that you remember them as I thought I may be going a little crazy haha. I assume they are for some sort of oil flow restriction? Since they were in such terrible condition (as mentioned above one crumbled in my hand) and we couldn't find any info on them, we decided to forge ahead and rebuild the rocker assembly without them and hope for the best (luckily we had two sets of hands haha). If you wouldn't mind looking in your microfische catalog to see what you can find, I would be most interested to learn more and I'm sure it would help someone else down the line!

Here are pictures of some of the "inserts":
Rectangle Wood Composite material Building material Brick

Rectangle Font Wood Building material Concrete

It almost looks like they were perhaps one piece and separated?

Here's the rocker assembly and cam all cleaned up:
Motor vehicle Automotive tire Electrical wiring Gas Automotive exterior



We're from the Oakland CA! Where are you located?

It was the gasket between the #3 and #4 cylinders:
Automotive engine gasket Automotive tire Audio equipment Wood Motor vehicle


Block all cleaned up:
Motor vehicle Auto part Gas Machine Engineering


Since we're in CA, we have to keep the whole emissions system stock for smog purposes. We have talked about registering it out of state so we could do some smog deleting, but that'll most likely happen only if we need emissions parts that we can't get or that are prohibitively expensive.

We'll be working on it this weekend and we've already got most everything back together so hopefully we'll be starting it up tonight or tomorrow!!!
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So I dug out the microfiche machine last night and found the O-Ring part number. I didn't rememebr you were looking for two types of parts as the "inserts" are different as you point out.
So I started searching the O-ring part number with not much luck, I came across this website which seemed to match my microfiche card.

I belive you need for the inserts:
813012174PLUG,ROCKERSHAFT
and 8173-14-323 for the o-ring.
MAYBE a mazda dealer might have this around somewhere.
Another source would be to find a 1982 ford Courier parts manual and perhaps available with the Ford number. The O-ring could probably be matched up. The "inserts" may prove difficult.
Also of note there is a bulletin referenced in the lower right of the exploded diagram found on that link.
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Very interesting! Thanks for dusting off the microfiche machine and taking a look! Also thank you for the link, I imagine that site will prove very useful in the future.

I think you're correct and that the Plug 813012174 is what we need. I believe that the multiple "inserts" I found were originally one piece in each rocker shaft that had disintegrated/split with time/heat cycles

The Felpro kit we got did include the O ring so we're all good on that but thanks for the part number regardless.

In other news, we got it back together and It's Running!!! It seems to be running just fine and providing adequate oil to the rockers/cam without those plugs but if I'm able to locate the plugs I'll pull the rocker assembly again and replace them. if that's the case I'll report back here with the info on how to find them.

Thanks again for all your help!
Very interesting! Thanks for dusting off the microfiche machine and taking a look! Also thank you for the link, I imagine that site will prove very useful in the future.

I think you're correct and that the Plug 813012174 is what we need. I believe that the multiple "inserts" I found were originally one piece in each rocker shaft that had disintegrated/split with time/heat cycles

The Felpro kit we got did include the O ring so we're all good on that but thanks for the part number regardless.

In other news, we got it back together and It's Running!!! It seems to be running just fine and providing adequate oil to the rockers/cam without those plugs but if I'm able to locate the plugs I'll pull the rocker assembly again and replace them. if that's the case I'll report back here with the info on how to find them.

Thanks again for all your help!
Glad to help.
If you need any parts I have plenty. Rare new aftermarket shocks. Aftermarket fuse panels because the OE units corrode. I have performance parts too, camshaft, header etc. but being in California I don't know if I would advise that. Not too many body parts anymore but some. Diesel truck ring center section in case you wanted steeper gears. I even have a reconditioned head. I have been saving all these parts thinking I will eventually have another one but haven't found one.
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