Thread: piston oil squirters

Assuming (I don't know) that the naturally asthmatic Isuzu does not have the oilways drilled in the block, I strongly suspect none have fitted the oil jets for piston cooling.

If the blocks are pre- drilled (as for the turbocharged engine, then it could be worthwhile - remembering our vehicles are considerably lighter than the Isuzu trucks and are not normally seeing peak boost pressure plus high fuel rates, or temps for extended periods.

I know there have been differences over the years in the oil pump between some 4BD1 and 4BD1T engines. I don't know if there are pump differences between those of the same year model, specifically for oil cooling of pistons.

Hi LAmby

As John just mentioned, I too am of the opinion that these engines are way over engineered even for truck use, so taking into account the less than 20% of a trucks duty cycle that we expose our 4BD1's to then don't worry. I'm not and I'm 15psi at 550K old....

JC

Originally Posted by Bush65

Assuming (I don't know) that the naturally asthmatic Isuzu does not have the oilways drilled in the block, I strongly suspect none have fitted the oil jets for piston cooling.

If the blocks are pre- drilled (as for the turbocharged engine, then it could be worthwhile - remembering our vehicles are considerably lighter than the Isuzu trucks and are not normally seeing peak boost pressure plus high fuel rates, or temps for extended periods.

I know there have been differences over the years in the oil pump between some 4BD1 and 4BD1T engines. I don't know if there are pump differences between those of the same year model, specifically for oil cooling of pistons.

Does anyone know if the oilways are drilled and plug in late model 4BD1, someone must have had a look inside under the sump, would be good to know too. Also I came across a thread a while back that pointed out the difference between NA and Turbo 4BD1's. Does anyone know where I can find it, I think Dougal had something to say in it about the duifferences.
regards
Garry

I have 2 early 4BD1 N/A engines, 1981 from a stage 1 and the other from a truck, year unknown. Neither of these has a drilling in the oil gallery or even a spot for one cast into the block for the oil squirters.

I am looking to turbo one of them and was hoping they would be easy to fit, but it looks like a major job.

Possibly the later engines are different.

Lyle.

IMHO they are not required unless searching for huge boost levels and excessive EGT's.

AFAIK the later 1988 on engines are running turbo spec pistons, this in itself will help with lifespan at reasonable boost levels. I am at 15psi and 590degrees max, and have been higher earlier on with the auto box hooked up.

My engine has over 550K and not been apart/ touched, It was turboed at 420K and I would rely on it to get me to FNQ from here tomorrow towing my campertrailer fully laden, no question. (I wish I was doing just THAT)

JC

Originally Posted by Sparkie

I have 2 early 4BD1 N/A engines, 1981 from a stage 1 and the other from a truck, year unknown. Neither of these has a drilling in the oil gallery or even a spot for one cast into the block for the oil squirters.

I am looking to turbo one of them and was hoping they would be easy to fit, but it looks like a major job.

Possibly the later engines are different.

Lyle.

I have a 1990 4BD1 which due to some over enthusiastic sealant application will have the sump removed shortly. When I do remove it can anyone show us what to look for regarding the oil squirters and where they are located. This motor has the twin spin off oil filters and the exhaust manifold metal gasket strip used to protect the seal around the acousitic cover. These were on 4BD1T I am told.
regards Garry
Garry

Can't show exactly where the piston squirters should go, haven't had the sump off the 4BD1T yet and the manual is a little vague.

This is roughly the right area, they are offset to one side to clear the conrod. As you can see, no.2 had a little accident and tried to cause its own piston cooling.


This was a supposedly good block to replace mine which has porosity around no.1 cylinder, looked good till the sump came off.

As for the Engine itself, I can't agree more, WAY over engineered for what we are doing with them, even with higher boost levels and lots more fuel.

Every time one of my unfortunate ford loving mates tries to tell me his 351 cleveland is bullet proof, I show him this:


Normally goes quiet after that. Bore size is nearly identical, about the only thing though.

Lyle.

These pics should give you a better idea of where they go.

Cheers Eric