100 Series with Aftermarket Turbos blowing motors

[baby_troupe]

At my recent club meeting I heard that a few of our members have had problems with blowing up motors in their 100 series. All of them had 1 common thing & that was they all had an after market turbo fitted.
Have any of you guys heard anything regarding these problems.

[alki]

Are they 4.2 diesel motors?

I haven't heard of any yet

[baby_troupe]

Yeah mate 1999 model 4.2l.
I have heard of about half a dozen now & it is costing around 8k to fix.

The 1HZ isnt the best of engines to begin with, and the additional strain of extra performance can tip them over the edge if not set up correctly and within advisable limits.....

The 1HDT engine from the cruiser is a viable swap if the 1HZ hemorages though, and better respondant to changes.

[mav]

At my recent club meeting I heard that a few of our members have had problems with blowing up motors in their 100 series. All of them had 1 common thing & that was they all had an after market turbo fitted.
Have any of you guys heard anything regarding these problems.


when you say they are blowing the motors are what happens? (detonating pistons?) ???

[baby_troupe]

Not sure on exactly what is happenning. I will send one of the guys an email to find out what the cause looks to be.

[HDJ105]

At my recent club meeting I heard that a few of our members have had problems with blowing up motors in their 100 series. All of them had 1 common thing & that was they all had an after market turbo fitted.
Have any of you guys heard anything regarding these problems.


when you say they are blowing the motors are what happens? (detonating pistons?) ???


As the 1HZ is an Indirect Injection (IDI) engine with the combustion chamber in the cylinder head, like most IDI's they don't take well to the extra thermal strain sometimes caused by turbocharging and related fuel issues. Cylinder head and piston cracking are the common problems from aftermarket turbocharging.

Also, the pintle type injectors sometimes don't stand up to the extra cylinder pressures and can get carbon deposits under the seat which causes the spray pattern to go off well before the usual 100,000km service intervals.

Combine those 2 factors with the extra weight (~200kg) and larger frontal area of the 100 series (over the 80). The engine's duty cycle is now increased, as the drivers boot is into it for longer to get everything happening, and if the tuner has given the engine that little extra fuel (power) to keep the customer happy, then the safety envelope diminishes quickly.

I have a HZJ105, had the 1HZ turbo'ed and intercooled, and have now replaced the 1HZ with a 1HD-FT. Fuel consumption has decreased, power has increased some 20kW ATW, and I'm very happy ;D IMHO, the 1HZ has its place as a naturally aspirated motor, but the factory turbo diesel motor (direct injection, nozzle injectors, heavier pistons and con-rods, etc) is the only way to go if you need the extra power.

Greg Goulden
2000 HDJ105.