F134 Differences

Here's a picture of the fans. The fan on the left seems to move more air but it could just be my imagination.

 

This. The factory reduced the diameter, as an upgrade.

 

That may be true, but in military applications the bellhouse is sealed and can be pressurized for deep water fording.

 

My mistake, timing gears.

 

Thanks for clearing this up Howard. As I recall there was a service bulletin floating around and it gives the upgraded diameter. It's been a long time and I also kinda recall I welded mine up and re-drilled it.

 

My manual for the F-head states it was originally .070", then was reduced to .040" after engine #250095 to improve oiling at the front bearings.

 

I have read that if you are using an oil filter the return line take care of oiling the timing gears. Thus you can just install a plug in place of the oil jet.

 

I'll post up some pics of a standard F134 front engine plate next to a M38A1 engine plate for those that follow. I noticed a few minor differences. Pics will show them. Stand by until tomorrow. I will edit this post to add the pics.

 

Standard F134 engine plate on the top. M38A1 below. Notice the left side (in the picture) mounting tab is longer on the 38 plate. Notice the right side is slightly larger, in general,on the 38 plate. I didn't notice any other differences.

 

Good point H. I do not know the vintage of A1 this came from. It was in the parts haul I made this past winter and either he did not know the year of the A1s or I have simply forgotten what he said.

What years was the A1 in production? I think they started in 52 but I am not sure on that. No idea when the ceased.

 

52 to about the time of the introduction of the dauntless in cj's, i believe

 

I've got bits and pieces of a late M38a-1 I'll be putting together. The dash data plate has date delivered/date inspected as Jan, 1968. This agrees with the title as a '68. This is the "newest" A1 I've ever seen. Its a Canadian military evidenced by the designation "M38A1CDN2" and has a NATO stock number, and was built in Windsor, Ontario
-Donny