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questions on things I found during disassembly..?

Bushmaster6

Bushmaster6

Legacy Registered User
City
the Springs
State
CO
I'm pulling a 4.0 out of a wrecked YJ.. posted this question in my resto thread but no answers there..

anyone know what a series of "D" and "C" markings along the block might indicate? is this some code for engine rebuilders, compression tests, crate motors, anything like that? I have "D" hand painted on 4/5/6, and "C" painted on 1/2/3 side of block...
20110219doncylinders-1.jpg


second question.. does this noticeably cleaner freeze plug indicate anything? the lower two freeze plugs are both sheilded by the shim plate/spacer plate between the bellhousing and the block, but one of them looks worn/corroded, one looks brand new.. might this add to an indication of a service performed along with my "D/C" markings above?

20110219cleanfreezeplug-1.jpg
 
tried alot of different google searches and came up with nothing close to a description of marking the block with painted letters..

anyone here got a clue??
 
could it be machine work done to the block? different sized bearings? different bore size? (would be stupid, but it would sorta be a money saving thing.)

dunno...
 
Possibly a donor engine with a code from the junkyard? Several things under my hood have yellow numbers painted on at the salvage yard. I think it's a warranty thing so they know whether it came from them or not if I were to bring it back.
 
Definitely a new freeze plug, and yeah, the letters are probably some sort of junkyard code.
 
there was another post on here just recently with the same markings on an engine, I think it was by pappywaho, don't think anyone knew what that was on his thread either...

Freeze plug could just be a replacement for a leaky one. Other than hot tanking it (when you'd do all of them) why else would you just pull one??
 
may have been me

bigwalton said:
there was another post on here just recently with the same markings on an engine, I think it was by pappywaho, don't think anyone knew what that was on his thread either...

Freeze plug could just be a replacement for a leaky one. Other than hot tanking it (when you'd do all of them) why else would you just pull one??
Click to expand...

Eric,

I asked the same question in my "opinions on this YJ" thread in ramblings.. I noticed the markings in the photos I brought home/posted to that thread and asked about it there.. or maybe both Papawaho and I did at the same time..

curious that it appears in several places and isn't a "known" marking, I figured it must be some sort of "grade" for a test or perhaps an annotation that something was done to that cylinder..?
 
Ah, it's entirely possible I'm just :crazy: I knew there was another thread with that in it, just assigned it to the wrong person...
 
man.. now I KNOW that has to be some sort of industry standard, and would think it would be relatively easy to find online..

off to Google..
 
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