The Mitsubishi Pajero Owners Club®

CRAIGS2.5 · Posted: Tue Jul 08, 2014 15:44 Post subject: 2.8 Veg oil

Now my 2.5 runs fine on veg oil, that's why I brought it. My question is, is there any mods you can do to a 2.8 to make it run on veg oil without it breaking seals in pump or any other issues the 2.8s have with running on oil?
I would really like a 2.8 but it needs to be reliable on veg oil.

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rich r · Posted: Tue Jul 08, 2014 15:49 Post subject:

If you're running a 50/50 mix then you don't need to do anything to a 2.8, either the all mechanical pump, or the later EDC pump. In fact there are several people running 95% SVO/5% petrol on EDC pump 2.8 Pajeros with no issues.

The only seal issues are the usual ones that affect all 4M40 2.8 Pajero/Shogun/Delica engines, whether they're run on diesel or SVO - in that the seals need to be replaced every 80-100000 miles with the correct type of seal (ie not the cheap one!).

If you're planning on running high percentages of SVO in winter, then just like the 2.5 you might want to consider some sort of fuel heater. But you could just drop back to 50/50 when it's below 10C, and straight diesel when it's below 0C like many people do.

CRAIGS2.5 · Posted: Tue Jul 08, 2014 15:59 Post subject:

Yeah I would fit a FPH on like I have on my 2.5 and I think I would twin tank to help with starting.
Im sure I read that the 2.8s wouldn't run on it very well or is it just the front pump seal that's the only worry?
My girlfriend is going to use it as well so it would need to be pretty reliable.

albaby · Posted: Tue Jul 08, 2014 18:55 Post subject:

i run mine 50/50 its a 98 2.8 i havnt done anything to it at all i have had no problems

mark dale · Posted: Tue Jul 08, 2014 23:15 Post subject:

yea, no probs at all running 2.8's on it - currently running 2 x 2.8 paj's and a 2.8 delica on it, up to 80% in summer - wvo

Have run a delica on it for about 4 years previously as well - usual rules apply -

Mark " old oiler" Dale

NickA · Posted: Tue Jul 08, 2014 23:44 Post subject:

My 2.8 Pajero is currently running on approx a 75% mix.

My last fillup was 60L Veg Oil, 4.5L Petrol and 13L Diesel.

NickA · Posted: Tue Jul 08, 2014 23:44 Post subject:

I have no modification at all for mine to run on Veg.

Simon_W · ******* Joined: 21 May 2013 Posts: 4881 Location: Watford

On my 2.8 the injection pump started leaking from more than one seal within a month of running on 50/50 SVO/diesel. I will accept that it may have been a coincidence. The pump was overhauled and the various seals replaced with 'heavy duty' (Viton) ones capable of resisting vegetable oil. The cost of the overhaul just about matched my expected annual savings.

CRAIGS2.5 · Posted: Wed Jul 09, 2014 9:16 Post subject:

Just out of interest what was the cost to have the pump overhauled?
Also apart from the main pump seal are the seals on the 2.8 pump usually weeker than the 2.5?
cheers

Simon_W · ******* Joined: 21 May 2013 Posts: 4881 Location: Watford

The pump rebuild was £245 + VAT, which I thought was a good price. I also got some reconditioned injectors at the same time, at £48 each. The combination has made a big difference. The engine is much quieter, particularly on start-up, and I reckon it's about 10% more economical.

AFAIK both the 2.8 and 2.5 engines use the same Bosch VE-type pump, so I would have thought that the other seals would perform similarly.

I was thinking of overhauling the pump myself, but glad I didn't. However I did locate a seal set in Germany suitable for veggie oil. http://www.dieselkontor.de/product_info.php?products_id=68.

rich r · Posted: Wed Jul 09, 2014 13:40 Post subject:

Although the pumps are similar, the front seals behave very differently because the 2.5 (cambelt) has air on one side and fuel on the other, whereas the 2.8 (chain) has oil on one side and fuel on the other. The oil tends to degrade the seal material on the 2.8, whereas 2.5s have been known to be on their original seals at well over 400,000km (judging by what's on the Australian sites).

CRAIGS2.5 · Posted: Wed Jul 09, 2014 13:51 Post subject:

Thanks for the info, so as far as I can see the only prob with the 2.8 is the front seal. Is there anything else to look out for?

Have any of you twin tanked? Where have you placed the 2nd tank?
thanks guys

NickA · Posted: Wed Jul 09, 2014 16:10 Post subject:

Just a single tank for me.

dannypaj · Posted: Fri Jul 11, 2014 17:12 Post subject:

I've been running single tank with a heat exchanger for the last few years. Mostly 95% WVO, 5% Petrol and 0.001% 2-ENH with no problems all year round. Just added a water injection system as a precaution against ring gumming from long term use.

Jowter is twin tanking his at the moment, have browse on the other threads in this category.

CRAIGS2.5 · Posted: Wed Jul 30, 2014 9:34 Post subject:

If the front pump seal on a 2.8 starts leaking etc will it cause the engine to stop or splutter etc? Or will it just leak for a few days until I replaced it?