Thread: factory 4bd1-t county???

Factory narrow/civillian sixbies have a heat shield on the turbo inlet, I know, I've been looking for one for a fair while, anyone?. This is missing from your turbo, but of course may have been removed because it sits to close to the airconditioning system.

Still, at any rate it's a good score, looks like a standard 4BD1T/IHI turbo.

All looks a bit salty, hows the chassis, firewall and door frames? Does it have the old door handles?

Originally Posted by isuzurover

Yes the engine seems the right vintage. I cannot see the oil filter in the pic, that should be the giveaway. IME genuine LR T engines (and late model NA) had a single upward facing spin-on (z4xx), vs the dual downward facing element on trucks.

I agree, my mates '86 sixbe has had a twin/bypass spin on filter setup from new, with the factry retrofitted oil filter extension bits and pieces. I used the part numbers to set mine up. The oil filter assembly will be a dead giveaway as to whether it is a factory setup.

when the engine comes on boost it reduces the rack travel.

the later wide cab 6X6 with the different turbo[non waist gate] had no boost pressure signal hose-the alloy cylinder on the side of the rear injector pump was called a aneroid timeri guessing it cut boost fuel after a period of time.

more fuel more boost.lots of smoke.
more fuel more ignition timing advance.

i saw some dead early turbo with cartridge fiters.
i asked about why not retrofit the na oil filter to stop it getting broken off by the drive shaft-also why the different waterpump an thermostat housing.i had to modify parts to fit these engines on line.
the answer was it was a certified engine with suppliers warranty.

The boost compensator cuts fuel only and is operated via pressure signals from intake system which if the turbo has no waste gate reducing the fuel will limit boost it's all a vicious cycle

Originally Posted by Davehoos

when the engine comes on boost it reduces the rack travel.

When the engine comes off boost it limits rack travel. I have a write-up of boost compensator function on here somewhere.
Stock stroke is only 0.75mm, I am running around 2mm. Maximum stroke is just short of 3mm, so past about 140cc/1000 shots of diesel the boost compensator will need modification to stop it limiting injection volumes when on boost.

From 88 onwards they removed the boost compensator and appeared to limit fuel based on rpm instead of the boost signal.

This is very obvious in the fuel delivery graphs on the year models suggested by dougal .When I pull my finger out I'll post some graphs which from memory also have compensator settings on same page.

wow thanks for all the info, i have the 2 downward facing screw on filters in the engine.

iwill try to get a pic of air filter box over weekend, it is very large and is strapped onto the firewall

the county is covered in fish oil, the doors are stuffed and im painting replacements at the monent, the front bullbar mounts on county have been rewelded and there is a lot of bog around the body (im welding the worst parts).

thanks for all the info

brett

Originally Posted by RGD129

... i have the 2 downward facing screw on filters in the engine.
...

Can you take a closeup pic of the filter assembly - especially the adaptor/spacer which spaces the filter away from the block (so they clear the propshaft).