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timing marks on a 3306 cat

C

caterpillar guy

Well-known Member
I have the front cover off. I need information on the timing marks before I drop the crank out of it. There are no marks on the idler gear between the cam and injection pump. There are 3 marks on the crank. A C O not sure but guessed that The C was for the cam the O was for the oil pump and not sure what the A is for. There is a letter Y and a Z on the injection pump drive gear. They are approximately 90 degrees apart. I could post a picture of them tomorrow.
 
It's easy for you on the 6 cyl. You only time the cam and crank. The fuel pump is pin timed with a bolt in the flywheel holding the engine at #1TDC compression. The 3304 is a bit more complicated due to the balancer shafts needing timing as well.
Later Bob
 
I understand the pin timing. But if you have to take the crankshaft out That will not keep it in time while the crank is out. Also there is no dowel in the end of the crank to align the flywheel with the crank. There is a witness of where the dowel would be on either the flywheel or the crank. Will have to look. Also I have to change the crank. Number 6 rod is shot. One main moved the amount of the punch on the bearing that is supposed to keep them aligned in the block and cap. Cat is so closed mouth about any information on things. I could understand that better on the newer engines. A 25year old engine seems a bit ridiculous though.
Thanks for the help. I can put the flywheel back on and align the pin in the hole. I don't know as it will be of much value after the crank is out though. What are the other timing marks for on the crank and pump gears for. Also the rods and mains are not numbered for correlation with the position they are in. I can mark them to keep them in order. Again thankyou for the help.
 
The flywheel bolts are spaced so it only goes on in one position. The other marks are for use in a 3304 engine that has balancer shafts. Take the fuel pump off and reinstall later to get it timed right.
Later Bob
 
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