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Hi guys,

Was hoping some of you T4 engine/modding gurus might be able to help me identify some parts fitted to my new T4. I'm no expert on anything engine wise, but keen to learn. So bare with me if I get things mixed up.

Below is a photo of under the hood. It has an intercooler fitted but I was wondering if anyone can tell what its come out of? After a little looking round I think it might be from a Mitsibish L200? Though theres no fan underneath which I've seen on those ones.

I took a bit of a punt on the van as it came with little to no history but was told it had a pump from a Golf Mk3 TD. After reading on here about upgrades, would this be the AAZ LDA pump I've seen discussed or are there all sorts out there? I took it to a T4 specialist after I got it to get it fully serviced and cam belt/water pump changed. The guy there said that he'd not seen a pump like this one before which apparently isn't adjustable and is fixed with a single fixing rather than three. I might be massively miss quoting him and got completely the wrong end of the stick. But does this make sense to anyone?

As I say I'm keen to understand all this more and make any modifications that would be worthwhile to get some more power of possible.

Cheers!

183897


183898
 

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that intercooler is Japaneese in origin, many similar items used on l200's, pajero etc although fitted up there its more of an 'Inter-warmer' o_O

if the engine is from a car then the origonal (car) dipstick would be near the oilfilter ('front' of engine near radiator) and either be 'interesting' to access or (if converted properly?) re-positioned at the rear of the cylinderblock with the t4 dipstick & tube being used - this has the dipstick handle near the coolant expansion tank(y)

another AAZ-ABL/1X mod is the engine-mount bolts, AAZ has m6 threads & ABL/1X t4 engines have larger m10 threads to handle the engines wieght, this is sometimes 'forgotten' when swapping & smaller bolts used - that can snap with the engine 'falling out'馃ぁ

the AAZ code engine is basically the same as a t4's abl code engine with diferent injectors, injector-pump & slightly diferent turbo - all interchangable but best used as a set.

the AAZ's 'LDA' injection-pump has 'boost-sensative' fuel enrichment via an actuator on the top of the pump - this takes a reference signal via a pipe from the inlet manifold (commonly fills with oil from the breather & turbo leakage, this then eats the diafragm & looses boost)

better engine photos would help identify...

where are you located? if near South Wales / Swansea I could have a looksee...

Rich.
 

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Discussion Starter #3
Thank Rich I really apprciate your reply. I'll be honest a fair bit of that went flying over my head.... :)

I'm pretty sure its the original engine. The dipstick is easily accessible to the right of the coolant tank as you look at it.

The "inter-warmer" comment has confused/worried me :) Isn't that where most of the IC's are positioned? I'm sure I've seen plenty pictured there.

The guy at the garage showed me similar diagrams to the below. Basically the part circled in red only has the one fixing unlike the 3 shown here. He did find have diagrams of the one fitted to mine but I can't find it online now. He just said its not adjustable like the common kind and was probably used for a specific performance reason.

I'll try and take some better photos later.

I have family in the Gower so am down that way a fair bit! Might well take you up on that, thanks!

183901
 

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The "inter-warmer" comment has confused/worried me :) Isn't that where most of the IC's are positioned? I'm sure I've seen plenty pictured there.

The guy at the garage showed me similar diagrams to the below. Basically the part circled in red only has the one fixing unlike the 3 shown here. He did find have diagrams of the one fitted to mine but I can't find it online now. He just said its not adjustable like the common kind and was probably used for a specific performance reason.

I'll try and take some better photos later.

I have family in the Gower so am down that way a fair bit! Might well take you up on that, thanks!

intercoolers need airflow, mounted above the engine this is limited- hence interwarmer;)

if theres no engine undertray then theres less cool airflow @under the bonnet (& through the main coolantradiator aswell) due to the ducting effect...

as to timing, your mecanic obviously hasn't done much work on older diesels, the 'single' bolt (actually a nut) secures the pulley & timing adjustment is done by turning the whole injection-pump to suit(y) - unfortunately this is awkward and also involves more work so might have some bearing on what you were told;)

your 'interwarmer' will work but its size & position are not ideal:whistle:
if you want a better option then t5 intercoolers fit nicely between the headlights / between the front grille & radiator but need som thought to the pipework as I'm guessingyou have a 'top-mounted'* turbo (as used on the t4 1.9td (ABL) & AAZ engines)


Rich.

* mk3 golf TDI have a 'low-mounted' turbo that makes for easier & neater ic plumbing, also easier maintanance.

I have this setup in my '95 t4, along with a 1Z TDI conversion & t5 intercooler:)
 

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Discussion Starter #5
Thanks Rich! I should defend the mechanic as I'm sure he understood all this but was more than likely lost in translation to me :rolleyes: As long as the injection pump is ok and nothing to be worried about then (y)

Understand about the Interwarmer :LOL: maybe down the line I'll look at changing/upgrading it!

Do you think the current IC and pump will have made much difference? At the moment its the only T4 1.9TD I've driven so have no comparison. It pulls well, apart from up big hills. Quite interested in the 5th gear mod to get the revs down while cruising on the moterway above 60.
 

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Sorry forgot to say... it currently doesn't have an under tray, but I ordered one a few days ago so is on its way. Hopefully that'll help
 

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Do you think the current IC and pump will have made much difference? At the moment its the only T4 1.9TD I've driven so have no comparison. It pulls well, apart from up big hills. Quite interested in the 5th gear mod to get the revs down while cruising on the moterway above 60.
I think you've answered that question, if you increase thegearing then you'll either need more torque OR more throttle (fuel) to maintain speeds, if hills are already an issue then馃槣

as to t4 td power, they're no bmw:ROFLMAO::ROFLMAO::ROFLMAO:

my '95 t4 was a 1.9D (60 hp, non turbo) and people thought it was a td as it went so well (even thedealer I bought it from thought it was a TD!)
the td t4 ABL engine has a whopping 68hp when new, the AAZ has 75 hp? the aaz pump is more adjustable than that on the ABL BUT the standard turbo is too small for more than about 110hp flat-out so dont expect a racecar!

in comparison, the 2.5tdi t4's are 88 & 102hp but have more torque...

and the infamous '1.9 TDI' conversion using mk3 golf era donor is 90hp (mine was a '95 B4 Passat tdi donor with 314,000 miles before I fitted it into my van - 7 years ago & still going strong.)

I. use a .7:1 fifth gear, was .75:1 (standard) and I've tried a .65:1 but that had a large rev-drop between 4th & 5th that I did not find enjoyable although other people seem to accept such馃え

Rich.
 

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The 2.5TDi (102) has the inter cooler in the same position, but the under-bonnet fabric trim has a duct to blow air down on it.......maybe you have that?
If not, try to get one from a scrappers, or CaliCampers.
Still not as good as mounting in the front, but at least it does give some forced air.
 

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Discussion Starter #9
The 2.5TDi (102) has the inter cooler in the same position, but the under-bonnet fabric trim has a duct to blow air down on it.......maybe you have that?
If not, try to get one from a scrappers, or CaliCampers.
Still not as good as mounting in the front, but at least it does give some forced air.
That's a great shout! Just looked through the old threads here and found exactly what you're talking about.... just need to find one now!! (y)
 

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part number 701 145 699 A, at least the one I've got on the workshop has that number :whistle:

Rich.
Sweet thanks! Can still get them from VW in Germany according to Heritage parts. Do you know if I need to get some fixings for it or anything else?

Thanks for all your wisdom! :)
 

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Do you know if I need to get some fixings for it or anything else?

the duct slides (sidewaye) into channels in the underside of the bonnet, if ou look at the sound-deadening theres a 'panel' embossed in it that can be pulled out. theres usually a plastic insert in the bonnet frame that slides towards the drivers side & out - reverse fittment of the duct (y)

Rich.
 
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