Posted: Sat Nov 30, 2019 4:56 am Post subject: F134 Engine Block Numbers
Last night when I was doing some tear down, I noticed a set of stamped
numbers on the left side of the engine block. They are 90348 and
seemed to be on an area specifically for this. These numbers are
different from my jeeps serial number on the data plate. Do the two numbers correlate together or is this a serial number specific to just the
engine. Iíll try and get a photo up. Thanks for any information.
Someone else will give more details soon... so I'll just fill in what I know for now.
Orientation for a F134 (my terminology as I personally find 'left side' to depend on where you looking at it from):
"Front" is where the radiator is.
"Driver side" is where the exhaust is.
"Passenger side" is where the starter is.
There is a raised cast number on the passenger side down low which is the engine block casting number - there are a small handful of different casting numbers for the F134, so most M38A1 will share this number.
On the front, there would originally have been a stamped number on a flat machined spot on the block above the water pump - it's just at the mating line with the head. This is the engine serial number and is not connected or related to the body serial number. There is a prefix for this - MD would originally have been an M38A1 engine, RMD would have originally been a replacement engine made at Willys for M38A1, other prefixes for other vehicles. After the serial number in some cases there would be a suffix if bearings or cylinders were other than nominal size. Later in life when a block is machined to return the interface between head and block back to flat, it's not uncommon for this serial number to get machined off.
If an engine is rebuilt by the military they would (often? always?) attach a rebuild tag to it - I'm not sure if there is a standard location for this, but I believe it's an aluminum plate with stamped info on it that is attached to the block. _________________ Tundra (really my name, not my truck)
Thank you for the reply. I guess I could have been a little more specific on the location of the serial number. It is located on the exhaust side of the engine towards the bottom right if you are looking at it from that side. It is located on a machined flat spot that seems to be specifically for this.
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