How cold for cold adjustment of valves?

[roscoFJ73]

Someone showed me once how dropping the temperature of a piece of heated metal quickly does not mean it will contract as quickly as the temperatue drop.
My friend had 2 pieces of metal ,one would fit inside of the other. Heat the smaller one up and it would not fit because of expansion.
Dipped it in cold water ,it still would not fit.
Next day it would fit.
I can only assume the molecules need some time to reorganise themselves

 

[canucksafari]

I can only assume the molecules need some time to reorganise themselves

That's called a hangover.

 

[sandcruiser]

the overhead cam in the hd-t w/ shims is a very different setup to the 3b.

I'm trying to find a micrometer and do the measurements myself b/c I really don't want the truck sitting overnight at this point.... but I'll what I have to do.

 

[Matt16]

To cool the engine off faster, open the hood, park in the shade, when the manifold is cool enough to touch, then pour water over it. That's what I do with my 22RE and even with high voltage wires and way more electrical crap, I've never had an issue with this. A diesel shouldn't mind at all.

 

[Radd Cruisers]

To cool the engine off faster, open the hood, park in the shade, when the manifold is cool enough to touch, then pour water over it. That's what I do with my 22RE and even with high voltage wires and way more electrical crap, I've never had an issue with this. A diesel shouldn't mind at all.

Nope, it needs to sit overnight.

Feeler gauges work for checking the valve clearance.

~John

 

[sandcruiser]

feelers work for checking clearance, but don't I need a micrometer to measure the old shims to determine what size new shims I need?

 

[mudgudgeon]

feelers work for checking clearance, but don't I need a micrometer to measure the old shims to determine what size new shims I need?

you can take a pretty good measurement of shim thickness with a good set of vernier calipers. I used verniers as I didnt have access to a micrometer and wasnt about to buy one. I just double checked my measurement of each one to be sure I had taken an accurate measurement. There was a little guess work for a couple that had very tight clearances.
The hardest part of this is calculating out the thickness of new shims.
When I did mine I bought a couple of extras either side of max and minimum thickness to try and cover any miscalculation so I didnt have to go back to the parts store and get more to finish the job. I ended up juggling some of the old and new around to get the clearances correct.

 

[cruiser_guy]

Steve, I'd make notes of the shims for next time. Then you can measure them, order the right shims and make one trip to the mechanic, if you don't want to install them yourself.

 

[Ron R]

............Having said that I also have to say that so far (the rig is getting close to 250k kms now) about half the valves still have their original shims in there.
The only adjustment I've done so far was to get the valve clearance back into midrange of the allowed play. I never found one to be out of limits.
I check them about every 50k kms. This is more often than advised by a Toyota mechanic who told me once that checking the valves every 120k to 150k kms was more than enough for a 1HZ engine!
So far (last check was at 200k km) he seems to be right having replaced only some of the shims so far.
Next check is in a few weeks.....we'll see

Well did the valves today. All I needed (wanted)to correct was one valve (exhaust nr2 cyl) The .35 mm gauge went in fairly easy but certainly not the .40mm and so I changed the 2.65 plate and an 2.60 mm went in.
Just one of the 12!
Another story is the injectors. They all have to be replaced.
The repairer only has 5 in stock and the sixth is in backorder. Have to wait untill next week Tuesday

I was afraid this was going to happen. The engine started to run a bit rough lately and fuel consumption increased slightly.
Well if the new ones last for the next 250k kms there is nothing to complain about, I guess
Considering I've been refuelling at fillingstations one hardly could call a filling station (just fuel drums) or most strange filling station: at a train station... this was in Kazakhstan and the only place we could get dieselfuel. This was diesel used for diesellocs and we assumed if a loc was able to pull a freighttrain using this fuel we could use it as well. Actually I think this was one of the better kind of fuel we had over there.