I was trying to figure out if my truck had the original engine or not. I am pretty sure the engine was replaced, but if there is someone who could confirm this, I would appreciate it. I think the block serial number identifies it as a 1949 engine from a passenger car. The serial number is: GAA693I28 ( that is an "eye" not a "one" ) the truck is a 1946, 3100 series 1/2 ton serial number: 5DPJ7848
I am considering installing an oil filter system and was looking to see where the tie in locations would be. Looking at the oil filter instructions for 1949 I see the oil pressure take off, where the tee would be installed. I am wondering what the additional line ( see attached picture with mark ups ) is for. Is that an external oil line to a gallery of some sort, would that not be a good spot to tie into?
Thanks in advance, Steve
1946 Chev 1/2 ton - 6V/+ground/Bias-ply original - shake/Rattle and Roll! (SOLD) 1940 Chev 1/2 ton Franken/Restomod
The engine in your photo is either a 216 or a low-pressure 235, and the oil line you're referring to goes through the water jacket and supplies oil to the rocker arms from a fitting under the sheet metal side cover on the passenger's side of the engine. There is a roughly triangular-shaped sheet metal cover behind the exhaust pipe called an "oil distributor" that controls oil flow to that line. There should be a 1/8" NPT (pipe) plug beside the oil distributor that is the attachment point for the oil filter outlet line. Oil from the filter joins with the flow to the cylinder head after the oil distributor does its thing. The purpose for the oil distributor is to restrict oil flow to the cylinder head until pressure at the crankshaft reaches at least 15 PSI, something that happens only at highway speeds on most spray-oiler engines. Plumbing the oil filter output to the head results in at least a little oil reaching the rocker arms, especially on worn out engines with very low oil pressure. Jerry
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