Aircon AND endless air

**Bearman** · 29th October 2013, 05:26 AM

I have been going to do this for some time but still haven't got around to it (too many projects). Looked at the engine mount but decided it's too tight in there so have decided to go the pto way. I have the bottom mount military type and reckon the easiest way for me would be to add a pulley to the drive shaft where it exits the pto and mount the compressor behind the transfer.

**123rover50** · 29th October 2013, 05:46 AM

I have run jack shaft driven through a rubber tyre flexible coupling from the front of the crank. Drive the two compressors from that. One each side.
On the other truck I use that for the reefer comp but drive the air comp from a pulley sandwiched with a prop shaft on the rear pto of the LT95.
This shaft also drives the hydraulic pump for the Ramsey winch.
All the compressors are the piston type not swash plate and these are on Forward controls so the layout may not suit others.

**isuzutoo-eh** · 29th October 2013, 07:33 AM

Would a bottom or rear PTO be easier for running air and winch off the transfer? I understand the dis/advantage of the overload system of each for winching, but may be able to swap my rear for a bottom in the next week or two.

**Judo** · 29th October 2013, 10:08 AM

So how many pulley rows are factory? I'm sure I have 3.

Crank pulley - from engine outwards, there is:

1. Water pump / Alternator
2. Spare
3. AC / tensioner

I can look in more detail tonight if you want, but to me it looks like I have a spare belt row and moving the fuel filter would give perfect space on RHS. Potential issue is the radiator hose which is not connected in this pic.

**steveG** · 29th October 2013, 10:36 AM

Not 100% sure what the factory county pulley setup was Justin. Did think that the factory A/C was a double belt affair though which would use all your 3 belts.

My Stage1 engine only had a single belt pulley, and nowhere to bolt on an extra one.
Some truck ones (which I've now got), had single row with threaded holes to bolt on another single pressed steel pulley.
Then there's the triple row ones. Not sure if these are all a one-piece, or if some might be single plus a 2-row bolt on.

Steve

**Bush65** · 29th October 2013, 11:30 AM

My 4BD-T from an Isuzu truck has a single 'B' section belt that drives the water pump and alternator, from a groove in the harmonic balancer ring. There is a single 'A' section belt to drive the compressor from a pulley that bolts to the front of the harmonic balancer hub.

I have seen pics of others that have 2 'A' section belts to drive the water pump and alternator, and a single 'A' section belt driving the compressor.

**Shingleback** · 29th October 2013, 06:23 PM

Originally Posted by steveG

Thanks Andrew.
Was it a belt driven compressor?

Steve

Yes was belt driven from the PTO.

Andrew.

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