D2 - Tool for Removing Combustion Chamber

ive seen them on ebay when you look under cat tooling. they are a reasonable price

Can't remember the size but the usual approach is to make one up from a hex head cap screw.

I have the orginal cat tool ,and its just a piece of solid steel stock cut into an octagone ,about 4 or 5 " long .Mine is stepped half and half ,chamber size on one half and 1 and 5/16 on other half .If you had a local machine shop make it up on a milling machine ,it would not have to be stepped ,just strait octagone to insert into the chamber ,and same size socket on the other .I usually use a 3/4 impact gun and socket with tool to remove the chambers as they can be bears to get out if they have been in a long time .I always use antiseizure compound on the threads when I install the chambers with the proper torque .

http://www.mbsmfg.com/caterpillar-precombustion-chember-toolspart5.html

http://www.mbsmfg.com/caterpillar-precombustion-chember-toolspart5.html

I pulled my D4's and had a friend machine the tool. I tried the hex and they would not budge and I was hesitant to corner the bolt or the chamber. You could probably stack nuts on the bolt to get a full bite if you can't get something put together.

Below is a thread with quite a bit of input from a whole host of people. I had a pretty good cheater on the breaker bar to bust them loose too. Don't forget to drain your coolant before you start.

http://www.acmoc.org/bb/showthread.php?7408-Aftermarket-Pre-cups&highlight=combustion

The tool set that MBS Manfacturing shows is used to remove and intall precombustion chambers and bonnets on the later 5u -d2 and d-47u ,and d- 9u or 311 ,315 ,318 cat engines .I just used those tools Sunday installing thee chambers and bonnets in my 7u d-4
3J ,5J or 3400 Cat engines are different and need a octagone tool or a made up tool from nuts or bolt heads to fit the open hex in the chamber after the injector is removed

QUOTE "Mine is stepped half and half ,chamber size on one half and 1 and 5/16 on other half ."
OK
So what size is the Chamber end or am I missing something?
Jeff

QUOTE "Mine is stepped half and half ,chamber size on one half and 1 and 5/16 on other half ."
OK
So what size is the Chamber end or am I missing something?
Jeff