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roscoFJ73 · 01-01-05, 06:35 PM

Looking at the 1PZ crankshaft sketch in the parts diagram it appears as if number 2 cyl was deleted.
I always thought 4 sroke 4 cyl engines were perfectly balanced and 6 cyl were a little out of balance ,so a 5 cyl really seems out of whack.

Would they have had to repositon the crank big ends to make up for the missing combustion stroke? or would they be able to rejoin without the missing cyl ?

I never saw the reason for making 1PZ in the 1st place. The cost of setting up another engine assembly process and supplying a spare parts inventory unique to a 5cyl to save the cost of an extra cyl seems hardly worth the effort.
None of the landcruisers needed the extra room in the engine bay.
Landrover added a cyl to their asthmatic 4cyl which makes sense(but really should have used the Isuzu 3.9 6cyl fitted in some countries)

Bone I was speaking to an diesel engine rebuilder who has done hundreds of 1HZ and he told me that if 1HZ arent worn out from high klms then the next most common cause of engine failure is from overheating which warps the alloy head,blows the headgasket and allows coolant to enter the combustion chamber shattering the rings or worse

Usually happens at freeway speeds before you have a chance to do anything.
I am assuming the 1PZ would suffer the same fate.

I think the 1HZ is also discontinued and all the new motors are now turbo ready 1 HD or 1HD-FTE, with or without turbo

.

01-01-05, 06:35 PM	#9
roscoFJ73 Diesel for blood Join Date: Jul 2003 Location: west australia Posts: 6,633	Looking at the 1PZ crankshaft sketch in the parts diagram it appears as if number 2 cyl was deleted. I always thought 4 sroke 4 cyl engines were perfectly balanced and 6 cyl were a little out of balance ,so a 5 cyl really seems out of whack. Would they have had to repositon the crank big ends to make up for the missing combustion stroke? or would they be able to rejoin without the missing cyl ? I never saw the reason for making 1PZ in the 1st place. The cost of setting up another engine assembly process and supplying a spare parts inventory unique to a 5cyl to save the cost of an extra cyl seems hardly worth the effort. None of the landcruisers needed the extra room in the engine bay. Landrover added a cyl to their asthmatic 4cyl which makes sense(but really should have used the Isuzu 3.9 6cyl fitted in some countries) Bone I was speaking to an diesel engine rebuilder who has done hundreds of 1HZ and he told me that if 1HZ arent worn out from high klms then the next most common cause of engine failure is from overheating which warps the alloy head,blows the headgasket and allows coolant to enter the combustion chamber shattering the rings or worse Usually happens at freeway speeds before you have a chance to do anything. I am assuming the 1PZ would suffer the same fate. I think the 1HZ is also discontinued and all the new motors are now turbo ready 1 HD or 1HD-FTE, with or without turbo.