RISINGFAWN Report post Posted November 14, 2011 Page 74 of October 2011 FMCA is on the subject above. The article states that you can "For less than $12.00 you can purchase a blow by tube that attaches to the vent (installed blow by tube) and can be extended to behind and below the fan shroud intake, eliminating the discharge from the crank case as a source of cooling system contamination. I would really like to know where you purchase this item. It was not mentioned in the article. F316799 Robert W. Underwood email: risingfawn@usa.net Share this post Link to post Share on other sites
wolfe10 Report post Posted November 14, 2011 Robert, Welcome to the FMCA Forum. There is no standard "kit". Each engine and each chassis is a little different. This applies to all diesels built before 1/1/07. From that date, diesel engines have a closed crankcase system, so no vent. Note: some chassis makers fit an extension when they built the chassis as this is a very well known issue. Check before buying parts. Here is how to build a CRANKCASE VENT EXTENSION: Locate the crankcase vent. It will be the only OPEN hose coming down from the engine. As an example, on a Caterpillar 3116, 3126 or C7 is is a 1" ID open hose coming down on the passenger's side of the engine. It will likely have oily residue in/on it. Determine the ID of the existing hose. You will be buying a "barb to barb" fitting to secure the existing hose to a new oil resistant hose of the same ID. Use hose clamps to secure the old and new hose to the barb to barb. The new hose should be long enough to allow it to go behind (back of coach) the fan shroud so that oil mist can not be sucked up by the fan which would materially speed the rate at which dirt is deposited on the CAC (Charge Air Cooler-- the first thing in the cooling package with the radiator behind it). The only HAVE TO is that the hose continue downhill, with no rise that could trap water (moisture is one of the normal byproducts of combustion). In sub-freezing temperatures, the water in a trap could freeze and completely block the vent-- bad news for your engine. Secure the hose with nylon zip ties, etc. Brett Share this post Link to post Share on other sites
