3B Rocker Arm Variants, Help Needed

[lostmarbles]

...A 1984 model BJ42 should have a 1983 production date.....

... I did some rough guessing and the 0627365 block serial is from around Nov. 1983 which is about right for a 1984 model truck. ...

Rant time for me here Drew............

In discussing these vehicles I think we should always use production dates (and never mention "salesman-talk model year" or "first registered date" because I think those years/dates cause confusion and they mask the truth.

My July 1979 BJ40 sat in the showroom of Garden City Toyota in Perth as a demo vehicle for many months before being sold (probably in February or March 1980) but I always refer to it as a July 1979 model.

Automobile manufacturers and vehicle sales people know that trying to sell someone last year's model is an uphill battle so they create this b#llsh#t system to assist their sales and to try to avoid being stuck with "last-year's model" that no-one wants to buy or that they must to discount to sell.

We shouldn't help them prop up their b#llsh#t system.

When we need to buy parts for our cruisers it is the true production date that matters so let's ALWAYS stick with that.

 

[magnus_heydoc]

amaurer,
I have found a 'new to me' large diameter rocker assembly that's in good shape.
I'm curious though and for the future, but how exactly did you go about grinding out wear divots?
For example is this done exclusively at a machine shop or otherwise? Do you add metal?
I'm sure others would like to know as well.
aaron

 

[amaurer]

aaron,

I certainly didn't invent the rocker-divot-grinding procedure; when I joined the forum it was already common knowledge on this board. You just grind them with a dremel, go slow to keep the heat down. No need to add metal, there's plenty of adjustment available.

Here's a pic of mine prior to grinding:

I used a grinding stone like this

followed by some fine sandpaper discs to give it a reasonable polish.

 

[magnus_heydoc]

Hey thanks man. My old one looks like yours but I'd thought there was too much metal missing to do that. Good to know.

 

[dare]

I've just been through this myself.

My rocker shaft/rockers are toast so I picked some up off a junk engine in a farmers shed. Going by the ADR sticker on the rocker covers the motors were made only 2 months apart but of course I've managed to get either side of the changeover period.

As you can see the socket for the pushrod is different but they measure the same otherwise (so same ratio ect).

Anyone know if the early push rods will fit the later model lifters?

 

[stevebradford]

About grinding the rockers.

Wich last I checked were still available from Toyota.

3b rockers 13812-56030 (later)
Some info saved

Has any one ever welded the hole punched by the valve with 6010 weld rod then ground it down? Or any weld rod, all would be much harder than just cast steel.

The rockers might have originaly have had some hardening on that surface. Grinding them down would expose the softer cast metal.

Or is just grinding it all that’s needed for another five hundred thousand kilometres?

 

[valdezhilander]

I am the process of changing the head gasket on my 3B and found similar wear on all the exhaust rocker arms, the intakes seem fine. The arms are still available so I’m just replacing them. Once you wear or grind through the hard facing the base metal is exposed and will wear much faster and create more friction with the top of the valve stem.

 

[gerg]

Seeing those pictures, I venture the hardness is a mute point. Perhaps there is still some hardness left where it doesn't contact the valve.

 

[dare]

FWIW my motor has around 360'000kms on it and only 1 rocker showed any significant wear, even then it was nothing like what is pictured above.

What sort of mileage is on the motors with really worn rockers?

 

[Bluebj42]

So could you build them back up with some weld?