The Mitsubishi Pajero Owners Club®

Mark3 · Posted: Fri Jan 06, 2012 20:13 Post subject:

I would imagine the copper washers go between the injectors and the head? Rick????????

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v8 rick · Posted: Fri Jan 06, 2012 20:29 Post subject:

there are 2 copper washers under the injectors 1 large and a small one the larger of the two you cant really miss but the small one that sits under the nozzle is usually well covered in carbon so get missed quite often Wink

.

rick.

v8 rick · Posted: Fri Jan 06, 2012 20:32 Post subject:

to be honest ive done a good few heads now and when stripped they have had no small copper seal in the bottom of the injector port and have run perfectly well without any leakage .

rick.

Spacemonkey · Posted: Fri Jan 06, 2012 21:29 Post subject:

OK, so my coppers go under the injectors. What other seals /washers will I need? I intend to do this job on a weekend so won;t be able to get any seals if I don't have them to hand..

Mark3 · Posted: Fri Jan 06, 2012 21:39 Post subject:

If the other seals/washers used are copper there is no reason why you cant re use them

Spacemonkey · Posted: Fri Jan 06, 2012 21:49 Post subject:

True, I could always anneal them first. Just checking there's no rubber O rings or anything..

v8 rick · Posted: Fri Jan 06, 2012 23:08 Post subject:

no there is nothing else under the injectors , but dont forget you will also have 4 soft alloy washers/seals under the leak off rail , i have re-used these in emergency without problems but they can leak is re-used and you will need to be very careful taking them off .

rick.

Spacemonkey · Posted: Fri Jan 06, 2012 23:19 Post subject:

Ah, those I don't have... Confused

Here's what I have: http://www.ebay.co.uk/itm/160694237503?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649

v8 rick · Posted: Sat Jan 07, 2012 0:25 Post subject:

yes mate you have the larger of the 2 copper washers , but if i was you i would think about getting some leak off washers / seals just in case .

just out of curiosity what year is your truck ? the reason i ask is do you know that the 4m40 engine is fitted with 2 different types of injector , both types are identical to look at but they have different operating pressures , the ones in your link are for the later type edc engine ( 150 bhp ) the earlier type engine ( 125 bhp ) injectors open at a lower pressure so these two types are not interchangeable .

rick.

Spacemonkey · Posted: Sat Jan 07, 2012 0:59 Post subject:

Oh shoot- you're right... Embarassed

Oh well, anyone want to buy some injectors for the EDC engine? Confused

Saying that though, I run on high levels of WVO, and I'm sure I read that one of the things that the veg oil conversion injectors do is open at a higher pressure to make the spray better for veg oil...?

v8 rick · Posted: Sat Jan 07, 2012 1:06 Post subject:

the type of fuel you run has no relavance on the opening pressure of the injectors this is set by using different sized shims to adjust the spring pressure .

rick.

Spacemonkey · Posted: Sat Jan 07, 2012 1:31 Post subject:

It's to do with better atomisation when using veg oil. Elsbett do it in their kits for example. Have a read through here:

http://biodiesel.infopop.cc/eve/forums/a/tpc/f/159605551/m/3561056362

BTW, any idea what the pop pressures are for the EDC and normal pump's injectors?

Spacemonkey · Posted: Sat Jan 07, 2012 1:31 Post subject:

I know the fuel doesn't cause, it, what I mean is that the injectors have the pop pressure raised to aid burning of veg oil.

davembp · Posted: Sat Jan 07, 2012 10:43 Post subject:

as I understant it, the small washer/seal is a crush seal and acts as a heat sheild for the nossel!

Spacemonkey · Posted: Sat Jan 07, 2012 11:18 Post subject:

Well I've found a guy on ebay doing the three seal kit for a tenner so I can live with that. Rather get it right first time.

Secondly the guy who sold me the injectors will change them happily enough, so I recommend him highly! This goes some way to explaining the slagging off that the 'cheap Chinese Zexel copy' injectors get. If someone buys the wrong ones without knowing as I did, then they will fit them, think they're rubbish, get them setup correctly at extra cost and aggro, and hence the myth is born that Chinese injectors are rubbish...

After much, much reading last night I came to the conclusion that veg oil itself does cause the injectors to open at a lower pressure (as people have discovered doing pop testing) and also causes retardation due to a slower burn. This is part of the reason the engine sounds quieter which in turn is translated as smoother running on veg. This can be got around by either advancing the IP timing or setting a higher pop pressure. Or both as a higher pop pressure on diesel would need an advance anyway. A higher pop pressure is also needed for better veg oil atomisation. So I've read..

But I also read that the 4M40 engine has a straight jet squirt, not a conical spray pattern as most injectors do. This is from the factory guides. So in my situation of blending at 60-70% I shouldn't really need a modded injector, and don;t need a better conical spray as the 4M40 doesn't use one, hence why I am sending the injectors back and getting the standard ones. The ***135 injectors have a pop pressure of about 2300 psi for the EDC whereas the mechanical pump uses the ***129 injectors for a 2100 psi pop give or take.