Heat Exchanger

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Haro's picture
Heat Exchanger

Haro,  Webmaster
1999 Catalina 36 MKII

Much has been written about heat exchangers, but I was not able to find out the dimensions of the original end pad on a 3" heat exchanger, the "O" ring and the bolt size and pitch as listed on page 53 of the engine manual. I am in the process of making my own gasket from a plumbing rubber 6"X 6" by 1/8" pad. I was able to cut 2  3 1/8" pads from one 6X6 pad. The center hole can be made using a hole punch from Harbour Freight.

Danco 59859 Home Depot  Internet #303689103 Model #59859 Store SKU #1002903776 Store SO SKU #1002844297 NOT neoprene, $ 9.41  ( March 2023)
Home Depot Neoprene    Internet #303172661 Model #20-104-0125-06-012    12" X 6" X 1/8"   $ 12.75  Must be ordered.
Neoprene pad 8" X 8"  1/8" thick from EBAY   $ 9.27
After having the broken mounting brackets resoldered I wrapped the heat exchanger in a 12" by 12" by 1/8" neoprene rubber pad to avoid wear due to engine vibration.
The pad is available brom AMAZON


More about heat exchanger :  03-24-2023
Westerbeke parts can be ordered from Ess-Key Yards, Ink New York. 315 676-2711  https://www.ess-kayyards.com
3" Endcap only SKU 2938  $ 21.50
3" gasket SKU 22851  $ 8.48
"O" ring SKU 19321  3/8"X3/32" $ 2.22
Bolt SKU 18813  M10X20  DIN 933 $ 1.99

Catalina Direct  800 959-7245
3" Endcap with gasket and Bolt ( no "O" ring required)  #z3925  $ 29.25  ( stock availability is not indicated online)

I was able to locate the new endcap design at OUTBOARD MOTOR SHOP  333 Kennedy Ave, Oakland California. They were at $ 30.00 each. It came with neoprene gasket and screw ( stainless steel 3/4", using 14mm head") , "O" ring not needed . I applied Lano-cote before installation. They worked well. This cap is not flat but convex, similar to the round wide-angle rearview mirrors used on cars. To tightening the center screw places pressure on the edges of the cap.

Also available at below link


3 inch Heat Exchange End Cap Kit | Seakamp Engineering SK3300C

Special Price $22.78 MSRP: $27.00


Brand :Seakamp Engineering


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