Cat 3535, water in crankcase -what to service first?

[Hoser06]

Hi guys, Just wanted to get your recommendations on what you change/service first, when you discover water mixed with oil up to the top of the site gauge on a Cat 3535.
I normally throw a whole seal kit at it but maybe thats overkill?
Pumps running fine otherwise.
Also, do you do the same for a Cat 310 with similar issue?

Thanks for the advice!
-Mike

 

[Eric H]

A seal kit will not solve this problem. You need to replace the oil seals, part# 69 & 70 https://www.kleen-ritecorp.com/Images/3535.pdf
the easy way is to pull the head and drive a screw into the seal and pull it out (and the backup washer) and drive the new back up ring and oil seal. The problem with this technique is the risk of hitting the rod/plunger (part #650) with the screw and marring the rod which will create a burr on the rod that will cause the oil seal to leak. The hard way is to drain oil, remove the rear cover, remove the connecting rods, pull the cam shaft and push the seals out from the inside and reinstall all of the parts. You can do it the quick way or the safe way. Last time I did it the quick way I hit the rod.

 

[Jim L.]

My one and only 3535 experience with water in the oil also came with a water leak at the back of the head.

I got a service man from my distributor to put in the seal kit. It turned out the problem was a broken brass spacer ring in the seal/spacer stack. Since this spacer is not included in the seal kit, I was lucky the serviceman had one in his “box of misc. 3535 parts” with him.

 

[MEP001]

http://www.autocareforum.com/showthread.php?870-Water-in-Cat-3535-pump-oil

 

[ken-pro]

While the issue could be related to the inlet water seals, the issue is more likely related to the plungers. Either one or more plungers are cracked OR the o-ring seal on the plunger bolt has failed. Either issue will allow a direct channel for water to find the crankcase.

Contrary to popular belief, changing the oil seals will NOT fix your problem. Oil seals are designed to keep oil in the crankcase, not keep water out. If water is getting past the seals or the plungers, it will find its way into the crankcase, even in a pump with brand new oil seals.