Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×
RV Trip Planning Discussions

Go Back   iRV2 Forums > POWER TRAIN GARAGE FORUMS > Caterpillar Engine Forum
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 07-12-2022, 02:32 PM   #1
Senior Member
 
gpounder's Avatar
 
Join Date: Nov 2017
Location: Oakhurst, CA
Posts: 915
Fuel in Oil - CAT C9

First the clues -
Oil pressure at idle just 15 lbs - noticed that after exiting highway.
Oil film on Toad.
Oil level on Dip stick way over high limit.
No clear leaks.

History -
Occasional injector miss when cold and it goes away when warmed up.

Notes -
Running oil pressure is about 40lbs
Running fuel pressure is about 85 lbs
Fuel and oil system come together in the injectors, in the transfer/fuel pump. Seal failure possible.
Antifreeze levels are normal.
No engine codes, no alarms.

The fix -
Replace all injectors because there is no way to tell which one is bad.
Replace the transfer/fuel pump.

I am very mechanical have the tools but never did this kind of work so I hired a mobile CAT mechanic to do it and I assisted. Learned a lot too.

This engine has the HEUI pump and the fuel pump is attached to the rear of it. So the HEUI comes off and every part near the assemblies. About 7 lines got removed, 2 sensors disconnected, Primer pump, breather tubes and intake heater solenoid removed. Basically everything on the side of the engine except the air compressor.

Had to drain antifreeze so it got replaced.

Cost was about $10,000
Attached Thumbnails
Click image for larger version

Name:	injectors.jpg
Views:	78
Size:	420.4 KB
ID:	370841  
__________________
2007 Country Coach Tribute 260 Sequoia
40' DP w/Cat400, F494513, Lithium Battery & Solar
Live next to Yosemite
gpounder is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 07-12-2022, 05:01 PM   #2
Senior Member
 
Talloaks's Avatar
 
Country Coach Owners Club
Join Date: Feb 2019
Location: Tucson AZ
Posts: 456
Was sufficient access possible through the bedroom hatch and underneath, or did you pull the radiator as well?
__________________
John
2007 Country Coach Tribute; Cat C9 400; 2012 Ford Edge toad; Roadmaster Blackhawk 2 10,000 lb tow bar; Demco AF1 Braking System; 2007 BMW K1200LT Hannigan Trike Conversion; Member, IEEE, NFPA, PMI, NRC SRO (Ret).
Talloaks is offline   Reply With Quote
Old 07-12-2022, 05:03 PM   #3
Senior Member
 
JNSNWT's Avatar
 
Newmar Owners Club
Freightliner Owners Club
Join Date: Jun 2016
Location: Odessa, Tx.
Posts: 845
Sorry to hear your problems but good thing that you were able to get it fixed.

Did you have to replace the injectors due to high mileage?

I would’ve thought you could just replace the O-ring seals and gaskets and reuse the injectors
JNSNWT is offline   Reply With Quote
Old 07-12-2022, 05:11 PM   #4
Senior Member
 
gpounder's Avatar
 
Join Date: Nov 2017
Location: Oakhurst, CA
Posts: 915
Quote:
Originally Posted by Talloaks View Post
Was sufficient access possible through the bedroom hatch and underneath, or did you pull the radiator as well?
Did not pull radiator. The pump work was done on the side of the engine. Access was from the top and you could sit up on the side. Injectors are all on top, easy access though hatch.
__________________
2007 Country Coach Tribute 260 Sequoia
40' DP w/Cat400, F494513, Lithium Battery & Solar
Live next to Yosemite
gpounder is offline   Reply With Quote
Old 07-12-2022, 05:14 PM   #5
Senior Member
 
gpounder's Avatar
 
Join Date: Nov 2017
Location: Oakhurst, CA
Posts: 915
Quote:
Originally Posted by JNSNWT View Post
Sorry to hear your problems but good thing that you were able to get it fixed.

Did you have to replace the injectors due to high mileage?

I would’ve thought you could just replace the O-ring seals and gaskets and reuse the injectors
Had 75,000 miles on Injectors. None of the o-rings looked bad but they can have internal issues you may not be able to see.
__________________
2007 Country Coach Tribute 260 Sequoia
40' DP w/Cat400, F494513, Lithium Battery & Solar
Live next to Yosemite
gpounder is offline   Reply With Quote
Old 09-12-2022, 04:17 PM   #6
Senior Member
 
Join Date: Sep 2020
Posts: 1,454
Just curious… would an oil analysis prove diesel oil was in fuel? Does it just show up as low viscosity?
bpu699 is offline   Reply With Quote
Old 09-12-2022, 05:11 PM   #7
Senior Member
 
gpounder's Avatar
 
Join Date: Nov 2017
Location: Oakhurst, CA
Posts: 915
Quote:
Originally Posted by bpu699 View Post
Just curious… would an oil analysis prove diesel oil was in fuel? Does it just show up as low viscosity?
I sent the sample to be analyzed and told them I had fuel in the oil and they confirmed it saying the viscosity was off and they made an estimate I had 7.5% fuel in the oil. I can't say they had any special way to figure that out had I not said anything.

To me it was clear this had happened. Oil sprayed on toad without finding leak and overfull by 1.5" on the dipstick.

Update - I also discover high fuel pressure at 120 lbs as the regulator had failed.
__________________
2007 Country Coach Tribute 260 Sequoia
40' DP w/Cat400, F494513, Lithium Battery & Solar
Live next to Yosemite
gpounder is offline   Reply With Quote
Old 09-13-2022, 10:58 AM   #8
Junior Member
Commercial Member
 
Join Date: Aug 2020
Posts: 7
Quote:
Originally Posted by bpu699 View Post
Just curious… would an oil analysis prove diesel oil was in fuel? Does it just show up as low viscosity?
Yes, fuel dilution is tested for during used oil analysis and displayed as a percentage
.
There are several different method used....least accurate basically amounts to a lab making an educated guess based on viscosity loss ....the problem with this is "shear' also causes viscosity loss and has nothing to do with fuel dilution

The most accurate test is ASTM D92.....gas chromatograph.

Fuel dilution above 2% starts to become a problem.
__________________
Amsoil Larry @ www.SynLubePros.com
Amsoil Larry is offline   Reply With Quote
Old 09-13-2022, 05:13 PM   #9
Senior Member
 
Join Date: Sep 2020
Posts: 1,454
Cool, love learning more every day!
bpu699 is offline   Reply With Quote
Old 09-21-2022, 09:04 AM   #10
Junior Member
 
JSIM21's Avatar
 
Join Date: Sep 2021
Location: St Charles, IL
Posts: 16
Quote:
Originally Posted by gpounder View Post
I sent the sample to be analyzed and told them I had fuel in the oil and they confirmed it saying the viscosity was off and they made an estimate I had 7.5% fuel in the oil. I can't say they had any special way to figure that out had I not said anything.

To me it was clear this had happened. Oil sprayed on toad without finding leak and overfull by 1.5" on the dipstick.

Update - I also discover high fuel pressure at 120 lbs as the regulator had failed.
How difficult would it have been to just replace the regulator?
JSIM21 is offline   Reply With Quote
Old 09-29-2022, 10:40 AM   #11
Senior Member
 
gpounder's Avatar
 
Join Date: Nov 2017
Location: Oakhurst, CA
Posts: 915
Quote:
Originally Posted by JSIM21 View Post
How difficult would it have been to just replace the regulator?
The regulator is not hard to replace, easy access, 20 min job.
__________________
2007 Country Coach Tribute 260 Sequoia
40' DP w/Cat400, F494513, Lithium Battery & Solar
Live next to Yosemite
gpounder is offline   Reply With Quote
Old 09-29-2022, 06:21 PM   #12
Senior Member
 
ftodaro's Avatar
 
Join Date: Feb 2015
Posts: 719
I have an oil consumption issue that I have chased for years. I though I was getting fuel in the oil so I pulled the injectors and replaced the seals. Sadly no change in the consumption. Did you replace those expensive cat bolts that hold the injectors in place? they recommend new at 20.00 each for the big ones. I am handy with tools but this was my first time pulling injectors, by biggest fear was dropping a bolt down into the engine at the bottom of the head.
__________________
Frank, Columbus, Ohio
2001 Itasca Horizon Cat 3126B 330hp, 2018 Jeep GC Limited, EPS harness or 24' Enclosed Car Hauler
ftodaro is offline   Reply With Quote
Old 09-29-2022, 06:34 PM   #13
Senior Member
 
gpounder's Avatar
 
Join Date: Nov 2017
Location: Oakhurst, CA
Posts: 915
Yes I did this by the book and replaced all the injector bolts.
__________________
2007 Country Coach Tribute 260 Sequoia
40' DP w/Cat400, F494513, Lithium Battery & Solar
Live next to Yosemite
gpounder is offline   Reply With Quote
Reply

Tags
cat, fuel



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
C12 Cat oil analyst by Cat Dealer MO Fred Caterpillar Engine Forum 6 03-19-2020 05:26 AM
CAT C9 HEUI, oil pump, oil cooler problems jpkimmey Caterpillar Engine Forum 8 10-22-2012 11:39 AM
2002 Journey/Cat Fuel and Oil Filters bellsharbor Winnebago Industries Owner's Forum 4 11-19-2007 04:27 PM
Oil Requirements for Cat C7 w/ Ultra Low Sulfer Fuel? Pusherman Freightliner Motorhome Chassis Forum 14 02-13-2007 06:03 AM

» Featured Campgrounds

Reviews provided by


All times are GMT -6. The time now is 01:53 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.