riser question.
#1
Registered
Thread Starter
Join Date: Dec 2009
Location: Westville New Jersey
Posts: 86
Likes: 0
Received 0 Likes
on
0 Posts
riser question.
I have a marine 454 with no risers. The question is. Do the stock risers stop water from going into exhaust headers? Is there a one way valve in them?
#3
Registered
Thread Starter
Join Date: Dec 2009
Location: Westville New Jersey
Posts: 86
Likes: 0
Received 0 Likes
on
0 Posts
Do I need 2 water hoses to each header?
I'm still piecing this engine together. Do I need the water hose to the riser and to the bottom of the header? Can I block the riser hose hole? Will water flow from the bottom header hose up through the riser ? Thanks Mike.
#5
Registered
iTrader: (2)
Join Date: Aug 2005
Location: Between A Womans Leggs in IL
Posts: 6,306
Likes: 0
Received 1 Like
on
1 Post
Fixx
what everybody else said,mercruiser had several different thermostat housings..Some had 2 hoses and some had 4 hoses,you will need to ger the rubber caps with hose clamps or remove the nipples in the risers if you can get them out and install npt plugs..Then route the hose from the thermostat housing the the bottom nipples on the exhaust manifolds...It the nipples are plastic on the manifolds get rid of them and go with the brass ones..
check the inside your exhaust tips for flapper's,this keeps the water from waves rushing in when the engine is off..If their is none their you will need to either get the external flappers that are held on by a hose clamp if you have straight tips or if their angled you will need to have some installed internally..
check the inside your exhaust tips for flapper's,this keeps the water from waves rushing in when the engine is off..If their is none their you will need to either get the external flappers that are held on by a hose clamp if you have straight tips or if their angled you will need to have some installed internally..