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Old 01-27-2008, 11:07 AM   #1
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Forty-two thousand on our 2000 Itasca Horizon. Someone asked the other day if the valves had been lashed. I didn't even know what that is. Some sort of adjustment in the mechanism that lifts valves etc. (or so I was told)
Unless they do this at the Freightliner factory shop, then it has never been done.
What happens if it is not done? Does the engine perform better or get better milage if it is?
What does it cost? and do I have to leave it overnight at the Cat dealer?

Is this something that needs to be done on all diesels? If so my Ford F-250 Powerstroke with over 100K has never had it done either.

thanks
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Old 01-27-2008, 11:07 AM   #2
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Forty-two thousand on our 2000 Itasca Horizon. Someone asked the other day if the valves had been lashed. I didn't even know what that is. Some sort of adjustment in the mechanism that lifts valves etc. (or so I was told)
Unless they do this at the Freightliner factory shop, then it has never been done.
What happens if it is not done? Does the engine perform better or get better milage if it is?
What does it cost? and do I have to leave it overnight at the Cat dealer?

Is this something that needs to be done on all diesels? If so my Ford F-250 Powerstroke with over 100K has never had it done either.

thanks
doc
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Old 01-27-2008, 11:26 AM   #3
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According to my local CAT dealer (which was consistent with what I had read in many other sources), the valves need to be adjusted on your engine before the fourth (4th) oil change or no longer than 40,000 miles. Then again at 100K miles.

The best price quote I found for the service was at the Freightliner factory service center in Gaffney, SC. I ended up paying the local CAT service center about $350.
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Old 01-27-2008, 11:29 AM   #4
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Hi doc,

The Ford Powerstroke would have hydraulic valve lifters and such an adjustment wouldn't be required because the lifters would compensate for any wear.

I can't say if the Cat requires such an adjustment, bit if it does it would be to adjust for the wear that occurs on the camshaft, lifters, push rods, and valve stems. Again, if it's required, it probably has solid lifters.

Take a look in your Cat service manual (if you have one), if it's required it should say so in the maintenance section.

Thanks for posting in our new Cat Engine forum, hopefully someone who knows more about this will come along and give a better answer.
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Old 01-27-2008, 11:31 AM   #5
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Oops, I was typing while "smlranger" was posting. Looks like he answered the question.
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Old 01-27-2008, 01:13 PM   #6
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As smlranger has posted, the valves should be adjusted between 33-44k miles per CAT. You should get better fuel mileage afterwards.

I would take it to your local CAT dealer to have it done.
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Old 01-28-2008, 04:41 AM   #7
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Thanks guys. Looks like a trip to Gaffney is in the future...or maybe to a close Cat dealer.

Wonder where the term "lashing the valves"came from.
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Old 01-28-2008, 10:42 AM   #8
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My manual says by 30,000 miles. I have heard of folks having it done after 10K and seeing a differance in performance and mileage. Go Figure
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Old 01-28-2008, 10:51 AM   #9
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by doc:
Wonder where the term "lashing the valves"came from. </div></BLOCKQUOTE>
Maybe from here -

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Old 01-28-2008, 02:28 PM   #10
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Rusty, that is probably closer to the truth than one might think. The valve stems do take a pretty good lashing from the rocker arms.
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Old 01-29-2008, 11:32 AM   #11
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come to think of it, I could use a good lashing
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Old 01-30-2008, 04:20 AM   #12
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by doc:
Wonder where the term "lashing the valves"came from. </div></BLOCKQUOTE>
OK, time for a serious reply. "Lash", in the terminology used by older mechanics and assemblers, referred to clearance or free play in a mechanism. Therefore, "lashing the valves" sets the clearance in the valvetrain to design levels.

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Old 02-01-2008, 06:15 AM   #13
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IMO the only place to have this work done is a Cat dealer because they have the expertise to do it rigth, after all they do that to almost every Cat engine sold. I had mine done at a Cat dealer that was not recognised as an authorised Cat RV place but there were 3 other MH there for service. They had enough experience to know what panels to remove to gain access to the top of the engine (mine has a rear closet and a piece of flooring from the engine hatch to the closet must be removed, no obvious way unless you had performed this service before).

They also reflashed the engine ECU with the latest SW.

Good luck
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Old 02-01-2008, 08:59 AM   #14
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Welcome Chuck to IRV2 forums, come often and post much.

I to agree with the Cat Dealer for service thought. I kind of think the other shops would fall under the Expert at all, Master of none. I want the Master on my engine
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