Riser - MerCruiser Direct Replacement Tall Dry Joint Center Riser, 14 Degree Down Angle, EDP Coated (Mercruiser p/n 864591T02) (#104591C)
Part #: 104591C
This product is no longer available.
Direct replacement "Internally & Externally Coated" DRY JOINT exhaust riser for MerCruiser V6 & V8 engines. This product replaces MerCruiser P/N: 864591T02. This riser is EDP coated for added corrosion protection. This riser also includes the appropriate mounting kit.
In 2002 Mercruiser changed on the V6 and Small Block V8 engines from the standard style of exhaust to the newer Dry Joint Exhaust systems. The purpose of this was to reduce the risk of leakage at the gasket between the manifold and exhaust riser. It should also be noted that the height and down angle of the exhaust elbow changed as well. It was felt that the overall height of the exhaust elbow should be raised to meet the total height of the engine. Therefore in 2005 Mercruiser created the 1.5" taller exhaust elbow which included a 14 degree down angle versus the standard 7 degree. This then created an issue regarding the use of risers. For example when 3" risers/spacers are installed along with the taller elbow this means the overall height of that installation was taller than the previous installation with 3" risers. Therefore Mercruiser created the 1.7" and 4.5" riser/spacer to account for these installations where the standard 3" & 6" spacers were already at a package height limit.
Short Dry Joint Elbow p/n 864309T02 s/n 0W309999 and below (pre 2005 models) - Measures 5.2" from elbow flange to mounting bolt bass pad. SELECT THIS LINK TO VIEW EXHAUST DRAWING.
Tall Dry Joint Elbow p/n 864591T02 s/n 0W310000 and above (post 2005 models) - Measures 6.7" from elbow flange to mounting bolt bass pad. SELECT THIS LINK TO VIEW EXHAUST DRAWING.
NOTE: If you are trying to replace an older NON DRY JOINT exhaust with the improved DRY JOINT you will want use the "Short" Dry-Joint elbow/riser as that will be the closest fit to the old Non-Dry Joint Elbow/Riser being replaced.
The riser fits to following engines and manifolds:
Engines | |
---|---|
MerCruiser V6 & V8 | GM 4.3, 5.0, 5.7 & 6.2 Engines. |
Manifolds | |
104612C | PPT Dry Joint GM V6 Exhaust Manifold |
105735C | PPT Dry Joint GM V8 Exhaust Manifold |
864612T01 | Mercruiser Dry Joint GM V6 Exhaust Manifold |
865735A02 | Mercruiser Dry Joint GM V8 Exhaust Manifold |