Thread: head gasket

Originally Posted by DRanged

Hey guys

Has anyone got the Isuzu part number for a head gasket for a 4BD1T (is it different to a n/a engine??). Having a few weird problems with pressure in the cooling system since running 15psi boost. have a gut feeling it could be a head gasket. but if someone knows something else pls feel free to enlighten me.

Thanks
Justin

Pm rovercare he has just been thru this in the last week

No idea if they're different, but compression on these things is that low, one would hope the head gasket will hold up to 15psi of boost and extra fuelling

My head gasket rapidly got worse in less than 3km @ 10 pound, <1km @ standard fuelling <1km 1 screw turn in and <1km 1 screw turn out, but fresh rebuilt motor , all head bolts cracked to release, aside from 2 which were tight, but maybe not tight enough, not enough to lay blame on the builder, the turbo or anything unfortunately.......so no real answer as to why, everything straight edged well, I didn't pay to get it built, I bought it rebuilt

But check the pics in my build thread, it was leaking EVERYWHERE

I've now travelled around 500km @ 15psi and 2 turns out and all seems wellm fingers crossed

Mine was pressureising the cooling system, so bad, it bypassed the pressure cap and from stone cold, pumped pressure in the cooling system, enough to make the rad hoses rock hard in <15sec

I will be lifting the rocker gear and retorqueing the head, before I leave for Sydney this weekend

Also I will be replaceing the rocker gear bolts, as one begun to stretch at 20nm so they're done as by elbow torque cheap **** bolts

Originally Posted by rovercare

No idea if they're different, but compression on these things is that low, one would hope the head gasket will hold up to 15psi of boost and extra fuelling

My head gasket rapidly got worse in less than 3km @ 10 pound, <1km @ standard fuelling <1km 1 screw turn in and <1km 1 screw turn out, but fresh rebuilt motor , all head bolts cracked to release, aside from 2 which were tight, but maybe not tight enough, not enough to lay blame on the builder, the turbo or anything unfortunately.......so no real answer as to why, everything straight edged well

But check the pics in my build thread, it was leaking EVERYWHERE

I've now travelled around 500km @ 15psi and 2 turns out and all seems wellm fingers crossed

Mine was pressureising the cooling system, so bad, it bypassed the pressure cap and from stone cold, pumped pressure in the cooling system, enough to make the rad hoses rock hard in <15sec

And the PN for the gasket would be?

Originally Posted by rangieman

And the PN for the gasket would be?

I don't have a 4BD1t, I have a 4BD1 that I;ve bought a turbo on

is the it same engine that is used in the army 110's, if so i should be able to get you a part number...hang on my contact is not working the rest of the week

how quick do you need the number

Originally Posted by weeds

is the it same engine that is used in the army 110's, if so i should be able to get you a part number...hang on my contact is not working the rest of the week

how quick do you need the number

If you can find out if the head gasket part No.s vary between the N/A 4BD1 as fitted to the 4x4 and the factory turbo 4BD1t as fitted to the 6x6

Originally Posted by rovercare

If you can find out if the head gasket part No.s vary between the N/A 4BD1 as fitted to the 4x4 and the factory turbo 4BD1t as fitted to the 6x6

yep, i assumed that, was honing around in a 6x6 last night......if i had access to the net and seen this post prior to 10pm last night the part number was sitting on a shelf not 2m away from me

Originally Posted by rovercare

No idea if they're different, but compression on these things is that low, one would hope the head gasket will hold up to 15psi of boost and extra fuelling

My head gasket rapidly got worse in less than 3km @ 10 pound, <1km @ standard fuelling <1km 1 screw turn in and <1km 1 screw turn out, but fresh rebuilt motor , all head bolts cracked to release, aside from 2 which were tight, but maybe not tight enough, not enough to lay blame on the builder, the turbo or anything unfortunately.......so no real answer as to why, everything straight edged well, I didn't pay to get it built, I bought it rebuilt

But check the pics in my build thread, it was leaking EVERYWHERE

I've now travelled around 500km @ 15psi and 2 turns out and all seems wellm fingers crossed

Mine was pressureising the cooling system, so bad, it bypassed the pressure cap and from stone cold, pumped pressure in the cooling system, enough to make the rad hoses rock hard in <15sec

I will be lifting the rocker gear and retorqueing the head, before I leave for Sydney this weekend

Also I will be replaceing the rocker gear bolts, as one begun to stretch at 20nm so they're done as by elbow torque cheap **** bolts

Thanks for the info mate. Mine seems to be very slowly pressurising at the moment but I will do some more tests. Sounds the same as yours though. I measure the intake pressure at the bend into the inlet manifold, where is your boost guage reading from???

Justin