EM6-300 head gaskets

[Johnny93]

What is the difference between a EM6-300 and a E6-300 engine? I believe the M stands for maxydine.

I’m needing to do a head gasket job on my 1984 EM6-300 and I’m having a hard time finding parts, all the parts I find are labeled E6 I can’t find any upper gaskets kits that are labeled EM6 are the gasket kits universal?

The kit I came up with is a PAI 3899

[Vladislav]

The difference between Maxidyne and Econodyne is the torque curve shape. The difference is achieved by the injection pump settings and the turbo. I too would like to learn what particualary is changed in the pump but haven't seen leads to such info so far.

Speaking the matter of your interest both E6 and EM6 have similar metal. Heads, pistons, rods, cranckshaft, bearings etc. I'm not almost sure on the cam shaft, maybe someone else can explain that point. Head gaskets are also similar between two engines. Worth to admitt there were 2 valve and 4 valve E6-350 engines and 2V and 4V EM6 either. The gaskets used on 2V and 4V are also of the same style (same part#). It seems surprizingly since 2V and 4V heads sure have different design but Mack fitted them using the same gaskets.

PAI number for E6 head gasket kit is EKG-8425 which conteins EKG-8424 gasket plus 3 EFR-8421 steel fire rings. One kit is for one head. The number you mentioned is probably a big upper engine kit or so.

Also worth to point out Mack engine overhaul manual prescribes swapping the head gasket as a recommended procedure. But the fire rings are the must. Actally the gasket seals coolant and oil passages only with the combustion area sealed by the rings. New PAI gaskets aren't expensive though.

[Johnny93]

Thanks Vladislav that is some great information! 

[Freightrain]

I got my top end gaskets for my 237 from Ebay.  It was a Felpro kit.