Looking ok. Actually better than I expected. Looks like the electronics on the TB are toast but the SC and IC tanks look good.

Should I do a writeup on the swap? I looked at the 4.0 to 4.2 swap reference thread but didn't see too much step by step info.

 

Hey Adam.....please do a write up for the site if you can.
Before, during and after pics c/w tools used, prices paid and time taken would be great too as well as any tips hints or tricks you gathered along the way

Anything you can do would be great......I'd be interested to se how you get on for sure.

Good luck with it

 

Other side looks good too

Plugs look fairly fresh

 

Hmmm, better than expected really .

 

Adam, you might have got lucky on the non plastic bits, it looks worse than it is?

Are you going to use a 4.0 engine harness and injectors? I'd be ordering all new hoses and gaskets. Have you got a late model throttle body you can use?

How far are you going to strip the engine down? To be 100% sure it'll fire first time, it might require all engine sensors replacing, knock sensors, crank sensor, cam sensors, etc. You should be able to use a lot of the original engine what year is it? AJ26 or 27?
What was the engine out of? If it ran a ZF box, you'll need to swap the drive plate.

This should be an interesting and fun thing - the bonus is a potentially great engine, just don't skimp on the parts required. I wouldn't fit anything that's doubtful, just go with new stuff as the unit cost was low. That includes waterpump

Good luck!

 

Hey Sean,

Thanks for the pointers. I plan on using the bottom end plus heads and swapping the rest as per the posted guide. The old motor is an AJ26s. The trans has a Mercedes part# so I assume it's a ZF. The drive-plate will be swapped. The car is missing the 02 sensors and Cats. I plan on making cat-less downpipes and getting new 02 sensors with mil eliminators.

Any other maintenance issues with the AJ34s that I should address while this thing is apart?

 

Thanks Adam, this write up will be great, I have this swap in my car project to-do que.

 

The MB box is a Mercedes built 5 speed box .......the ZF transmissions are in the non SC cars.

 

Yeah, I was a bit tired when I typed this. I do remember looking at it and seeing the MB 722 part number, which would make it a 722 trans. It's a very common series of MB transmissions. I am way too familiar with it as I have a variation of the said trans in my 911 Turbo.

http://www.6speedonline.com/forums/9...ml#post3271210

 

Tent pitched and the awning stretched, I'm good.

 

I'm almost ready to tear into it. I had to reinstall the lift since I recently moved and organize to garage (somewhat). I should be starting soon. Here it is awaiting

 

Very nice 699, Is that an AJ36 (from an S type R) or an AJ33 (from an X350 XJR)?

Where abouts in Chicagoland are you? I'm also in chicagoland.

 

Hey Count,

I'm in Palos Hills, where are you at?

It's from a 2004 XJR so an AJ33s. I didn't even know there was an AJ36, it's not in the Wiki. What's the specs on that one?

 

Hi, I'm out in Oswego.

AJ36 is the 4.2 litre mounted in the S type, the AJ33 is the 4.2 litre mounted in the Alum XJ while the AJ34 is the 4.2 litre mounted in the XK. The first two are nearly the same- you'll see the intercooler entry is centre fed and the intercooler roof has a concave profile.


This was done to try to improve airflow distribution. The AJ34 still uses a rear fed intercooler not dissimilar to the older AJ27 S/C units in both the X308 and X100 4 litre. It was found that there is a compromise between airflow distribution and absolute restriction across the intercooler itself.
In terms of performance all 3 variants of the 4.2 litre V8s are rated the same- the losses across the intake trunking of the AJ34 are slightly higher (140 mbar at peak power vs around 130 mbar).
I'd be interested to see whether you can fit the centre fed intercoolers into an X308 or whether it fouls something

 

adam -
I'm envious of your garage! What is the size of your workspace?

 

So the differences are just in induction? I was going to swap over all of top end (from heads up) from the old motor since I'm not swapping the ECU or harnesses, but I guess it would be nice to utilize the more efficient pieces. Any advice?

 

Garage space is definitively a selling factor for me in this property. I'm glad to have a GF that understands and supports my hobbies

The workshop is about 1.5 cars deep and 1.5 cars wide, but It's the ceiling height that appealed to me the most and the attic, storage space. Whoever build this place was definitively seeing eye to eye with what I'd have in mind.

I installed the lift yesterday and the concrete is solid 4-5" deep with a vapor barrier underneath. It was built in '95 and there is not one crack in the slab so it's gotta be quality.

I also got lucky with one of these right next to the workshop as the previous owner had a boat. Helps keep the rain off my toys

 

No, I'd go with your original plan,
the AJ33 heads are a bit nasty with the lower manifold and assymetric port design- they flow only marginally better than the AJ27 but should have flowed better. If you're going to modify a cylinder head the AJ33 ports possibly have more metal to fettle.
I HATE the wrap around squish of the AJ33!
As regards the intercoolers- it's about the same- the AJ33 style has better distribution while the AJ27 has lower losses.
When doing your AJ27 top end build, I'm just interested to see if during a 'dummy build' the AJ33 style intercoolers foul the bonnet if they were to fit.

 

Today's Work

My Father watchfull of any snags



The '98 exhaust manifolds look puny and restrictive next to the '04 ones. I'm itching to get the LS manifolds and put them side by side.

 

When you thread the engine and tranny back down into the hole, it has to go down and backwards. Since they are so massive, and the other bits around the engine bay are so flimsy by comparison, how do you keep from squashing things on the way in? Looks pretty tricky to me!