"Warning" against 6637
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Posting Guru
Joined: Oct 2007
Posts: 1,130
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From: Bloomfield Hills, MI
"Warning" against 6637
Was at the shop of a very well known mechanic and diesel man today who was working on my truck. He has a duracrap that puts out some nice numbers and does tuning for sled pull trucks and stuff like that. He commented on my 6637 "I highly recommend that you change filters, the paper from the inside of the filter can be sucked off during high boost" Something along those lines. He said a fiber/oil element is the only way to go - but make sure you keep it oiled! He said he has seen these filters eaten from the inside out from the turbo sucking so hard. Any one buy this? Im a little skeptical ...
Cargo Master
Joined: Apr 2004
Posts: 3,162
Likes: 1
From: Vilonia Arkansas
I have been running 6637's on my last 2 psd's and have no such problems and mine will pull upwards of 34 lbs of boost. Over the road big rigs have been running the same style paper element for many many years with no problem.
Cargo Master
Joined: Jan 2001
Posts: 2,726
Likes: 5
From: Slatington, PA
Well if that were true, you'd be much more likely to suck the paper off a stock filter cause its more restrictive. Not saying it couldn't happen, but it could also happen to the filters he recommended.
Posting Guru
Joined: Oct 2007
Posts: 2,225
Likes: 1
From: Farmington, Minnesota
Have "WE" seen any failures yet. There are some out there putting up boost # in the mid 30's with no problem. I wouldn't be worried, but I can say that because I run one of those oil media filters
Laughing Gas
Joined: Mar 2004
Posts: 789
Likes: 16
From: West Coast/L.A. Area
I never heard of the paper being sucked off during high boost. Not sure what he meant by fiber/oil filters but the K&N which is cotton/oil filter rates poorly in filtering out really fine dirt but as I remember had slightly better flow.
Laughing Gas
Joined: Mar 2004
Posts: 789
Likes: 16
From: West Coast/L.A. Area
I never heard of the paper being sucked off during high boost. Not sure what he meant by fiber/oil filters but the K&N which is cotton/oil filter rates poorly in filtering out really fine dirt but as I remember had slightly better flow.
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Posting Guru
Joined: Oct 2007
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From: Farmington, Minnesota
There was also a post with someone having a filter simular to the 6637, and it did not hold up. The turbo didn't fair well.
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Posting Guru
Joined: Oct 2007
Posts: 2,225
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From: Farmington, Minnesota
I remember that post too.
Post Fiend
Joined: Feb 2007
Posts: 14,541
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From: Dallas-Ft. Worth
There was someone that posted here maybe a year ago about one getting sucked apart, but he said it wasn't water damaged or anything that he knew about. I believe it was either wet at some point and he didn't know about it, or it was just flat out defective. I've seen what they can take abuse-wise, including my crushed one -- I'm not the least bit worried. BTW, it wasn't crushed flat lengthwise, more like if you were holding a beer can normally and just crushed it in your hand. It was still scary...
Gone, but not forgotten
Joined: Oct 2005
Posts: 5,026
Likes: 2
From: Charlotte-Fairbanks-Bflo
I finally figured it was time to chime in here as I am a big supporter of the 6637. If the Duramax owner was badmouthing it I will take it for granted that is is something that will not work with his hand grenade waiting for a place to explode. The 6637 is by far the most cost effective mod we can do to our trucks. I have been using a 6637 style filter on my Cat 3208 for 22 years, the only difference being the Cat application is 5 or 6 times bigger and costs 3 times as much. It has been completely trouble free all these years, and that includes climbing the steepest grades America has to offer, been on the deserts, been to Alaska, you get the picture. Should have told the guy to take a flying leap.
Lead Driver
Joined: May 2007
Posts: 5,613
Likes: 9
From: Flagstaff, Arizona
Was at the shop of a very well known mechanic and diesel man today who was working on my truck. He has a duracrap that puts out some nice numbers and does tuning for sled pull trucks and stuff like that. He commented on my 6637 "I highly recommend that you change filters, the paper from the inside of the filter can be sucked off during high boost" Something along those lines. He said a fiber/oil element is the only way to go - but make sure you keep it oiled! He said he has seen these filters eaten from the inside out from the turbo sucking so hard. Any one buy this? Im a little skeptical ...
Too many people talk smack about things they just don't understand!