Cat D3B fuel leak on injection pump

[Rocky River]

I have a fuel leak coming from the #3 bonnet seal on the injection pump, question is do i need to have the pump rebuilt or can this be performed on the dozer?

 

[thepumpguysc]

On the dozer.. if theres room.. most times its just an oring.. other times the bonnet has eroded & needs to be changed.. they're cheap..

 

[Rocky River]

Thanks, i bought the orings and bushings from Cat. Also i got the spline tool to remove the bushings, only issue i have is ive never done this before and not quite sure of the correct process to change it out.

 

[thepumpguysc]

Clean & blow off the area GOOD.
Remove the injector line & get it out of the way.. {slight bend}
Get a socket or something that will fit over the snubber [middle piece} but fit around the bonnet..
now smash the hell outta it 3-4x to break it loose from all the crud..
Blow it off again..
NOW, insert the tool & wack IT w/ a hammer a couple of x to seat it..
NOW, use an impact to break it loose.. you only get about 2 tries.. then the bonnet strips out..
IF that happens, your up the creek.. Good luck..
The torque on the new bonnet is 90-110 ft lbs.. I go 90.. & if she weeps, ease it up 10..

 

[kshansen]

Have to love the precision process that includes:

"smash the hell outta it 3-4x to break it loose from all the crud..
Blow it off again..
NOW, insert the tool & wack IT w/ a hammer a couple of x to seat it..
NOW, use an impact to break it loose"

I would expect Cat to at least spec. the weight of the hammer!

Of course those instructions are from someone who has been there before not some engineer in a white shirt who has never touched a pump that has had dirt or water on it!

 

[Rocky River]

I appreciate it, thank you. I will update when i get done.

 

[thepumpguysc]

And THAT's IN THE SHOP.!!!

 

[d9gdon]

That is usually my first instinct when working on delicate stuff too. Patience? I don't have time for that LOL.