New engine for my NF???

[jack n rory]

I have an 89 NF 3.0 6g72 and have been told by my mechanic that i have done the head or the head gasket and that I would be better off putting a reco engine in rather than getting any repairs done. She has done 360000k and is on dual fuel and I am happy to put a reco in if I have to. I would appreciate any feedback from anyone that has done this job, or anyone who has got any other ideas. I am going to be replacing it myself. Was basically a weekend car as I was driving a work van through the week and really did not notice any problems until I started driving her full time.

[jimako]

Hi There,
Id recommend putting in a 6G72 out of a MK Triton or a TE Magna as they are LPG compatible, Might be a bit more work than a straight swap but well worth it..

[jack n rory]

Any particular reason why. How much extra work is involved. I am presuming that my existing motor is normal 6g72 pajero motor and it is on gas. So I am not sure what you mean by compatible

[6G74]

Any particular reason why. How much extra work is involved. I am presuming that my existing motor is normal 6g72 pajero motor and it is on gas. So I am not sure what you mean by compatible

The engines were not designed to run on gas - the reason you have cracked a head or done a gasket its prolly attributed to the fact it is on gas.... the triton and magna jobs were gas compatible.

As for the work, ive heard of lots of surgestions, but not of anyone actually doing it - i may have heard you can use your origional loom, but not to sure...

If your paying a mechanic to do the job, it wont be worth doing, you'd be better off puttin in another motors in 5 or so years time again.

[jack n rory]

Do you mean that I would be better off putting a normal pajero engine in now and again in five years when the head goes again??

[6G74]

Do you mean that I would be better off putting a normal pajero engine in now and again in five years when the head goes again??

Dont hold me to time frames but yeh, i dont think the initial cost and hassel will outweigh the benifits - you may get 10 years, ya may get a week....

[jimako]

If your going to do the job yourself and dont mind doing a little extra work and spending i little more money.

All the Mechanical work should be straight forward, if using a 6g72 out of an MK triton.. At (MOST) you would need to change wiring loom and computer.
The triton runs a 6 coil pack, where the the paj runs the dizzy.

Will be more powerful compared to the old 6g72,
24 valves instead of 12.
Engine is good to run on LPG unlike the old 6g72.

And i dont think you would need an engineers certificate for this conversion as they are the same motor.

Depending on how much you love your Pajero, what are your plans for it?
If your planing to keep it for long enough, or your planing to upgrade soon.

I Have an NH Paj, running the old 6g72, id like to put it on LPG but i dont want to run the motor down to soon as a result of using lpg, ( as these motors were not designed with LPG on mind )

But as soon as i have to change the motor or funds become available, i know i would be upgrading it to the Triton motor, and then getting LPG.
For the sake of a little extra money for the loom and computer, id be doing it as im planing to hold on to my paj for long enough.

You decide whats best for you...
Jimako

[jack n rory]

Thanks for the advice. Here is some info that may be of interest. I spoke to about six or seven LPG specialists and they all said more or less the same thing and that was that the problem with these motors being on gas is that the valves and guides dry out and seize due to LPG being a drier fuel than petrol. Reco motors come with brass inserts in the guides and this allows them to run on LPG without any hassles. Now I know we cant trust all mechanics but all of them said pretty much the same thing!!!!

[jimako]

Thanks for the info.
How about the Valves?
From all the questions i asked and the info i gathered,
I was under the impression that nothing can be done to make these motors LPG compatible.
Thats why i was looking at other options,.

Still i wouldnt pay for a reco engine before talking to whoever rebuilt the engine and ask them if they are built to suit LPG,
and if your warranty will be void if using LPG..
just to be sure.

Its a fair bit of money to spend on a reco engine, id like to be sure before running it on lpg. Because if there not compatible id rather spend a little more to do the conversion.

Let us know how you go..
Cheers

[jack n rory]

Have spoken to the company that I am getting the engine off and they assure me that engines are reco'd LPG compatible and have the same warranty that would apply to fitting to a vehicle running petrol only.
I will let you know how I go. By the way have just noticed your location, I am in W/vale, we might have been talking to some of the same people!!!

[Hodad]

Gday all, I dont know that much about it, but you may be interested to hear my experience with gas. I have an old diesel swb at the moment, but my last car was an (also old) holden. I had a gas system fitted to it by a guy in Melbourne, and he more or less said to me "I'll do it, but forget about petrol'. I ended up with no petrol tank, a huge gas tank, and the sweetest running motor (an old 253) I have ever had. The timing was advanced right out to suit the gas, and I threw in an electronic ignition dizzy. Oil changes and general maintenance were done at pretty erratic intervals.

I got well over 250 000 smoooooooth kilometers from that motor after the installation, god knows how much it had on it before then.
This bloke reckons it's not so much the 'dry' fuel, it's the fact that if you are gonna run duel fuel, the engine will generally run too lean on gas because you can't set it up properly for both fuels.

I'm no expert, and this is just one guys opinion, but you may want to ask about this when talking to installers.

Cheers Ian

[jack n rory]

Thanks for your thoughts. I did speak to a mechanic who said the same thing, to just run LPG and forget about the petrol. I am still considering it.

[Mitcon]

I've spoken to Mitsubishi about the Pajero 3L motors and running LPG. Now I have no idea if it's true at all but they told me that it's just because of the original valves, seats and pistons not being suitable. I was always told that this was the main reason alot of older cars should have a upper cylinder lube kit if running LGP or Unleaded fuel.

I can't understand why a Pajero 6G72 can't just have valves, seats and pistons fitted that are LPG compatible and be fine ? I'm too worried about it all to fit gas to mine but I really wanted to originally but am now left too unsure. But I see lots of Pajero's out there running on LPG.

End of the day if the people your getting the new/reco motor off will warranty it if running LPG then sounds like it's "all good".

As to it running better if only running LPG well that would make sense to me as if you only run one type of fuel you can adjust and tune the car correctly for that fuel. When running duel fuel you are always running a compromise for the convenience of using 2 fuels. I'm not keen on using just LPG as I have found that alot of country servo's don't have LPG

[jimako]

Thats what i thaught, Valves, Seats and Pistons.
And rather than getting it recoed to suit, i think im still going for the Triton motor, a good second hand and i might just do the heads.