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Old 26-06-21, 12:59
Big D Big D is offline
Darryl
 
Join Date: May 2008
Location: Dunedin, New Zealand
Posts: 661
Default JXD versus JXLD

Hi all,

I’m looking for some advice on the Hercules engines for the M8/M20 armoured cars and whether the resident experts have experience with the JXLD engines as opposed to the JXD. I see some have fitted JXLD engines to M8/M20’s but I was wondering whether they were left in stock condition or whether they were ‘made to look’ like a JXD setup.

I need to put another Hercules engine together for an M20. I have several JXD blocks here but all require lots of work including removing stuck pistons and machining/sleeving the bores. Some blocks have holes in the bores so I don’t even know if they are viable options yet. I have plenty of pistons, rings, valves, bearings etc and providing one of the blocks is suitable, I could put something together. I have carburettors, fuel pumps, manifold etc but would need a timing cover, sump and a few other bits and pieces.

The other option I have is a Hercules JXLD engine which was in the M20 I have here. I’m guessing that this M20 was retrofitted with the JXLD when it was in the hands of the Greeks. I still need to investigate the internals of the engine but it is certainly in complete condition and has the required timing cover and mounts.

I understand the JXD and JXLD short blocks are similar, with the JXLD having a longer stroke and the external parts located differently on the block. There seems to be a lot of similarities and the timing cover, head and starter motor setup appear the same as the JXD. I understand the M8 manifold is a bolt on and the generator mount is the same as the M8.

The JXLD water pump and distributor/coil assembly is different to the M8/M20 JXD setup. The fuel pump is located on the other side of the block which pushes the oil filler/breather to a different location.

Subject what I find internally with the JXLD, what I have in mind is to make it look like a JXD as much as is possible and fit it to the vehicle. I can rebuild the other JXD blocks at a later time when finances allow it a bit more.

Has anyone tried to move the fuel pump on the JXLD to the other side, like the JXD? This would allow the breather/filler to be moved to the spot the fuel pump is currently located. Alternatively, I could just leave the fuel pump where it is without losing too much.

From what I can see I could fit a JXD water pump which would provide the right angle for the JXD distributor.

Has anyone tried to do this? What other hurdles are there?
Attached Images
File Type: jpg JXD engine left side.jpg (158.1 KB, 6 views)
File Type: jpg JXD engine right side.jpg (153.3 KB, 5 views)
File Type: jpg JXLD distributor setup.jpg (94.1 KB, 3 views)
File Type: jpg JXLD engine left side.jpg (250.5 KB, 5 views)
File Type: jpg JXLD water pump.jpg (221.4 KB, 2 views)
__________________
Cheers,

Darryl Lennane

1943 Willys MB
1941 Willys MBT Trailer
1941 Australian LP2A Machine Gun Carrier
1943 White M3A1AOP Scout Car
1944 Ford M8 Armoured Car
1945 Ford M20 Armoured Car
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