I bought a runner with a carbed 22R that is knocking like crazy. I cracked open the pan, inspected the rods and there it was... or should I say there it wasn't. half a rod bearing completely destroyed. I have the letter B stamped on the caps but when I go to order the parts I have the options STD, .025, .050 sizes. I bought a Haynes manual and I'm not sure what the specs are in. Is it standard or metric. I'm a little confused here. Please help

 

Here is an example of big numbers vs little numbers (metric V imperial)

So what you are looking at is probably metric 0.25mm versus 0.010"

Are your crankshaft surfaces still pristine, if not a new bearing probably isn't going to last long. A friendly machinist might let you borrow the bore gauge you need .


These bearings are still listed as available from Toyota..
https://www.toyotapartsdeal.com/part...ft_piston.html

Not they have undersize over size and the Mark A,B,C ...

 

Man I was hoping that wasn't the case. I guess I need a new shaft as well. this one is far from pristine. it has a bunch of scratches on #3 1,2,4 look decent. Thanks for the info

 

The poor condition of the rod bearings and crank shaft makes me wonder what condition the rest of the engine is in.

I would certainly inspect the camshaft and rocker arms as well.

It might be time for a rebuild or a replacement engine.

 

Do you know if I can drop in an 85 22R? I can't seem to find any earlier engines. Also are the intake ports the same pattern? I just bought a new manifold and carb for this paperweight.

 

All 4runners came with a series 22 engine, the previous series is the 20r. The head didn't change untill 88-89. LCE has a good page that covers what changes when aswell there is a good engine builder magazine article that covers the changes.

 

That's good news. I only ask because my truck is an '84, but I keep seeing '85 and up when I look up engines. I didn't know if there was any significant changes other than the deck height and exhaust bolt pattern. I hear that 84 has a single nut in between 2-3 cylinder and a 85 has two. I always thought 22R was a 22R and the only differences were EFI and turbo. I never personally owned a Toyota myself, but it was common where I'm from. The closest thing was my Nissan Hardbody with a Z24.

 

Wait just a minute.

All 4Runners from this generation did come with the 22R series engine (if we exclude the V6 for 1988 and 1989), however, 1984 was the odd ball year, which is the only year of 4Runner to feature a carbureted 22R engine. This engine is of the "early" 22R type, which is different than the later 22R-E engines that came in the 4Runners from 1985 onward. 1984-1985 was the transition time from the "early" 22R series to the "late" 22R series. The early and late 22R engines while similar, have different engine blocks, different heads, different pistons, and different intake and exhaust ports. There was no change of the head design in 1988 or 1989 that I am aware of.

https://lcengineering.com/engine-22r...dentification/