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Tips and Tricks


Parts are not hard to find for these vehicles, despite what some may say.  Many parts are common to the later Defenders and high turn-over consumables are still easily available.  The 4BD1 was produced for nearly three decades in various forms so most parts are still readily available.   Also bear in mind the Isuzu engine itself rarely needs parts.  We have a full electronic parts catalog for the 4×4 and 6×6 Perenties.  Call or email us for a price and availability on anything you require.

Oil Filter Spacer for 4BD1T

Oil Filter Spacer for 4BD1T Engines

We have available a number of oil filter spacers for the 4BD1T engines with the twin oil filters.  Why do you need one of these?  If you are fitting an ex-truck 4BD1T engine to a Land Rover or Range Rover chassis the twin oil filters will foul the front propshaft.  The solution is to space the filter housing out towards the chassis.

These are the original JRA part manufactured for the 6×6 Perentie.  You will need longer mounting bolts.

Available now for $77 each (inc GST) plus any postage.


Clutches ain’t Clutches

The standard clutch as fitted to the 4×4 can only be described as barely adequate.  Isuzu and Land Rover knew this and fitted a “heavy duty” one to the 6×6 with the turbo motor.   This clutch is also underwhelming; it offers a paltry 20% increase in clamping force over the standard clutch.  We see regular failures with both.  This was fine for Defence; the taxpayer pays for replacements.  You, however, only want to pay for one clutch in your vehicle.

Our clutch kit offers almost double the clamping force of the standard clutch with the same pedal effort as the 6×6 clutch.

So when you buy a “heavy duty” clutch, make sure it is, and not just the 6×6 clutch.  It might cost a few dollars more now, but you won’t need to do it a second time, regardless of any other modifications you make.

Our clutch kit, which we fit to both 4×4 and 6×6 Perenties, consists of the drive plate, pressure plate, throwout bearing and spigot bush. We recommend machining the flywheel.

NEW PRICE!! (02/05/2016)  KLR Clutch Kit $750 

Clutch Rattle

We have a number of people wanting to replace their clutch to eliminate the clutch rattle.  The good news is most of the time this noise is not clutch rattle.  The noise you get with the gearbox in neutral and the clutch out with the engine idling is simply primary pinion rattle in the gearbox.  The uneven idle (or torque impulses) of the 4BD1 causes the gears to rattle against each other.  It does get worse as the gearbox oil warms up.  It is nothing to worry about and does not need to be fixed.

Fuel System

When you take delivery of your Perentie the first thing you need to do is clean the fuel system.  Strip the sedimentor and clean it.  Replace the fuel filter.  Remove and clean the tiny strainer on the inlet side of the lift pump – this is the most important bit.  Finally bleed the fuel system and you’ll be right to go.


The Perentie, being a military vehicle, does not have lockable doors or an ignition key. Fortunately it is an easy conversion to fit a key barrel to each door and the ignition barrel.

Wiring faults

Between the air filter and the firewall is a protection plate for the wiring harness.  Unfortunately this plate causes chafing on the harness.  Check behind it regularly, and if you start blowing fuses start looking here.


The LT95 gearbox and transfer case assembly is a strong unit, but can get expensive if a complete overhaul is required.  The Isuzu can be hard on gearboxes, however we have found the R380 and LT230 to be an excellent alternative – five equally spaced ratios without big jumps, smooth change, cheap and easy to overhaul.  The added bonus is they handle the torque of the Isuzu very well.  Conversion is a big job but we can advise you of the details, starting with our modified bell housings and clutch kit to suit.


The rear axles in the 110 Salisbury diff were far superior to the later Defender types, however they will flog out over time.  We highly recommend fitting Hy-Tuff replacement axles (previously Maxi-Drive).

Clutch Slave Cylinder

We have had a large number of failures with clutch slave cylinders.  It appears they are corroding and pitting from standing around and eventually leaking into the bell housing.  To check yours simply remove the wading plug and catch whatever fluid comes out.  If it is brake fluid you need a new slave cylinder.  We recommend replacing the master cylinder at the same time.  Don’t use cheap parts; they will fail.

Drive Flanges

We have noticed a number of Perenties coming from the auctions with loose drive flange bolts.  We do not know why, but it is a simple job to check yours.  A dead give away is a leaking drive flange.  Check your wheel nuts while you are there.