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.
Thread Tools Search this Thread Display Modes
Old 10-07-2010, 01:19 PM   #1
Senior Member
radams's Avatar
Join Date: Jul 2010
Location: Omaha, NE
Posts: 398
Valves tight

I took the C9 in to get the valve lash adjusted at 40k miles. They just called the DW and said it was ready to be picked up. They told her that that the valves were tight when they got in there. What does that mean? Good, bad, ugly?

radams 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 10-07-2010, 01:50 PM   #2
Senior Member
Vegasdan's Avatar
National RV Owners Club
Freightliner Owners Club
Join Date: Oct 2009
Posts: 1,874
Probably means they didn't have to adjust them.

2001 National Tradewinds 7370 300 Cat
2011 Jeep Wrangler Unlimited Sport
Officially fulltiming. The Journey Begins
Vegasdan is offline   Reply With Quote
Old 10-07-2010, 01:52 PM   #3
Moderator Emeritus
RustyJC's Avatar

Texas Boomers Club
Join Date: Jul 2000
Location: Cypress, Texas USA
Posts: 8,854
Generally speaking, tight valves result from valve/seat recession - the valves pound themselves into the seats and therefore move higher in the head (closer to the rocker arms) which tightens up the rocker-to-valve tip clearance.

This isn't necessarily as bad as it sounds. Some valve/seat recession is to be expected. It all depends on how tight the valves were as to whether or not the recession is excessive.

2016 Ram Longhorn 3500 Dually 4x4 CCLB, 385/900 Cummins, Aisin AS69RC, 4.10
2014.5 DRV Mobile Suites 38RSSA #6972
Come join us on a TEXAS BOOMERS rally!
RustyJC is offline   Reply With Quote
Old 10-07-2010, 02:01 PM   #4
Senior Member
radams's Avatar
Join Date: Jul 2010
Location: Omaha, NE
Posts: 398
Well now I'm really glad I got it done. It was one of those things where nothing seemed broken so I was hesitating getting it done. Thanks for the explanation.
radams is offline   Reply With Quote
Old 10-10-2010, 08:49 AM   #5
Senior Member
radams's Avatar
Join Date: Jul 2010
Location: Omaha, NE
Posts: 398

Thought I'd give you guys an update. CAT dealer performed a "run the overhead", changed the air filter, lubed the chassis, changed the oil and filter, changed primary and secondary fuel filters. And what did I end up with? I absolutely can't believe how well it runs. It is amazing. I thought it was running okay before and I've only got 37,500 miles on it so I figured that any improvement would be slight. Absolutely couldn't be any happier. That engine is running so smooth now you can't tell it from a gas.
radams is offline   Reply With Quote
Old 10-19-2010, 07:59 AM   #6
Senior Member
sailor_lou's Avatar

Nor'easters Club
Join Date: Jun 2007
Location: CT
Posts: 887
It's good you had it done. If the valve lash is too tight, they will not sit properly on the seat and in addition to performance loss, they will not tranfer the heat from the valve into the head. This will result in burnt valves and an expensive repair. Engine manufacturers specify maintenance activities for reason and too often owners ignore their recommendation because everything appears normal.

05 Travel Supreme 38DS04, CAT C-7
sailor_lou is offline   Reply With Quote
Old 10-20-2010, 03:56 AM   #7
Senior Member
radams's Avatar
Join Date: Jul 2010
Location: Omaha, NE
Posts: 398
Ah, I can see the logic on that Lou and appreciate the info. In my case it's less a matter of wanting to get the maintenance done and more a case of knowing everything that needs to be done. That's why these forums are such an invaluable resource for me.

radams is offline   Reply With Quote

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
Water Tank Fill Solenoid Valves - APEX Old Rv'er Alpine Coach Owner's Forum 5 10-11-2011 10:02 AM
The dreaded water heater check valves HotMech Winnebago Industries Owner's Forum 2 06-20-2010 10:49 PM
If you have not replaced your Hot Water Heater check valves, read this. LK23 Winnebago Industries Owner's Forum 28 05-07-2010 12:51 PM
Water Pump Valves Question Brewer & Nancy Excel Owner's Forum 2 08-11-2009 07:15 AM
Solenoid valves - water drain issues GypsyTurtle Country Coach Owners Forum 2 06-14-2009 08:12 AM

» Featured Campgrounds

Reviews provided by

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 02:42 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.