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I just recently disassembled my 1500 engine. I thought when I removed the pistons and rods that the numbered order marked on the rods was 1,2,4,3 starting from the front. Is that possible? Does it start from number 1 at the front? I probably just mixed them up knowing me. It is all going to the machine shop anyway but I am just curious. Also, my cam has a grove in it on the fuel pump lobe. Is that common or should I purchase another camshaft? The rest of the cam is excellent. Could that be from a wrong style pump or maybe not using the spacer? Thanks in advance.
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Engine internals questions
- Thread starter kawazar
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Usually they're in order as you describe, #1 at the front... but keep in mind the age of these machines and that they can have been subjected to some rather uncaring treatment at some point in their existence. I've seen some pretty scary things done to engines. Saw a Jag 4.2 once with a piece of all-thread as a head stud replacement, just as example. Couldn't tell from the outside, IYSWIM.
77_MG_Midget
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Rob, Yes to all of the above. The rods on a 1500 are numbered 1 - 4 starting at the front of the motor. Becareful not to mix up the rods and the end caps.
My cam also had a bad grove in the fuel pump lobe. This is caused by using the wrong fuel pump. If you use the fuel pump with the long shaft, you MUST use the spacer. Short shaft, no spacer. My PO just disconnected the pump and put in an electric pump 'cause he didn't know what was wrong. The shaft arm was all bent up also from this.
If you're going to run a stock fuel pump, you'll have to replace the cam. Otherwise, you could always use an electric pump and just seal off the fuel pump mount hole with a plate. Although I put in a new fast street cam, I'm staying with the electric pump and blocking off the manual pump hole in the block.
Oh, and I'm sure you know, but... If you reuse the same camshaft, DON'T mix up the lifters. They must go back onto the same lobe the came out from.
My cam also had a bad grove in the fuel pump lobe. This is caused by using the wrong fuel pump. If you use the fuel pump with the long shaft, you MUST use the spacer. Short shaft, no spacer. My PO just disconnected the pump and put in an electric pump 'cause he didn't know what was wrong. The shaft arm was all bent up also from this.
If you're going to run a stock fuel pump, you'll have to replace the cam. Otherwise, you could always use an electric pump and just seal off the fuel pump mount hole with a plate. Although I put in a new fast street cam, I'm staying with the electric pump and blocking off the manual pump hole in the block.
Oh, and I'm sure you know, but... If you reuse the same camshaft, DON'T mix up the lifters. They must go back onto the same lobe the came out from.
77_MG_Midget
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Oh, missed that... the order is definately 1,2,3,4 from the front of the motor.
jcatnite
Jedi Knight
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I'm not sure how many miles you have on your cam but you should mic out the journals. I hear that they are pretty soft. I'm not sure just how critical a thousands or so would be without a bearing but I was afraid to reuse mine since I was having oil pressure issues anyway. Have your machine shop check the cam for you if you don't have the equipment to check it yourself. I'm not sure how much oil pressure too much clearance around the cam would cost these motors but I've seen big block chevys loose almost all the oil pressure to worn cam bearings. (of course you don't have bearings and that makes it even worse in my opinion.)
JC
JC
Thanks guys. I kept all of the other parts in the order they came out in. I wanted to reuse the cam but I might go with the electric pump. I knew it was probably me when I moved the pistons and rods off of my bench. I forgot to check the numbers when I pulled them out.