Flushing engine
#1
Registered
Thread Starter
![Question](/forums/images/icons/icon5.gif)
With a 454 and setup that has transom pickups (no pickups through the outdrive) and garden hose connection for flushing. Why do you need to run the engine while flushing? I noticed when you first hood up the garden hose before you run the engine water comes out of the tail pipe. Why?
#2
Were doomed!
![](https://www.offshoreonly.com/forums/images/icons/charter_member_star.gif)
![Default](/forums/images/icons/icon1.gif)
Two things i can think of off hand....
1st your seawater pump will act as a block inthe line due to the rubber impellor and not let water run through properly if at all sometimes.
2nd most head gaskets from what i hear dont like more then 18-20 psi on them....and most municipal water supplys are 35psi or more so you run the risk of blowing a head gasket and filling engine with water.....
Thats my guess anyway
i always run the engine anytime i have water hooked up and running
1st your seawater pump will act as a block inthe line due to the rubber impellor and not let water run through properly if at all sometimes.
2nd most head gaskets from what i hear dont like more then 18-20 psi on them....and most municipal water supplys are 35psi or more so you run the risk of blowing a head gasket and filling engine with water.....
Thats my guess anyway
![Smilie](/forums/images/smilies/smile.gif)
__________________
-Wally
Money can't buy happiness, but it can buy horsepower. And I've never seen a sad person hauling a$$!
-Wally
Money can't buy happiness, but it can buy horsepower. And I've never seen a sad person hauling a$$!
#4
Registered
![Default](/forums/images/icons/icon1.gif)
Griff is correct. The cooling system is equipped with a bypass so that there is ALWAYS water flowing through the exhaust manifolds to keep them cool.
So in your example you're only flushing the exhaust system unless you fire up the motor and let it come up to temperature so that the thermostat opens and circulates water thoughout the entire system.
So in your example you're only flushing the exhaust system unless you fire up the motor and let it come up to temperature so that the thermostat opens and circulates water thoughout the entire system.
#5
Registered
Thread Starter
![Question](/forums/images/icons/icon5.gif)
Originally Posted by CPPerformance
Griff is correct. The cooling system is equipped with a bypass so that there is ALWAYS water flowing through the exhaust manifolds to keep them cool.
So in your example you're only flushing the exhaust system unless you fire up the motor and let it come up to temperature so that the thermostat opens and circulates water thoughout the entire system.
So in your example you're only flushing the exhaust system unless you fire up the motor and let it come up to temperature so that the thermostat opens and circulates water thoughout the entire system.
#6
Platinum Member
![](https://www.offshoreonly.com/forums/images/icons/platinum_member_star.gif)
Join Date: Mar 2004
Location: Hillsborough,NJ
Posts: 467
Likes: 0
Received 0 Likes
on
0 Posts
![Default](/forums/images/icons/icon1.gif)
If you are running in salt water, I would flush the motors also. By flushing the exhaust only you will be leaving salt water in the engine causing problems down the road.
#7
Registered
Thread Starter
![Default](/forums/images/icons/icon1.gif)
Originally Posted by NJSONIC
If you are running in salt water, I would flush the motors also. By flushing the exhaust only you will be leaving salt water in the engine causing problems down the road.
#8
JC Performance Engines
![](https://www.offshoreonly.com/forums/images/icons/gold_member_star.gif)
![Default](/forums/images/icons/icon1.gif)
You want to flush the engine, not just the exhaust.
To complicate this, lets say you have a crossover w/ no thermostat.
Will the flush run through the engine if not running?
To complicate this, lets say you have a crossover w/ no thermostat.
Will the flush run through the engine if not running?
#9
Registered
Join Date: Jan 2004
Posts: 113
Likes: 0
Received 0 Likes
on
0 Posts
![Default](/forums/images/icons/icon1.gif)
How does it work with a closed cooling system like a 496 or a 525
is it safe to hook up the water hose to the hookup on the swim platform and run the engine to heat up for a oil change ?
Or should I put on outdrive ears or put out drive in a tank of water?
is it safe to hook up the water hose to the hookup on the swim platform and run the engine to heat up for a oil change ?
Or should I put on outdrive ears or put out drive in a tank of water?
#10
Platinum Member
![](https://www.offshoreonly.com/forums/images/icons/platinum_member_star.gif)
Join Date: Oct 2002
Location: DFW, Texas
Posts: 1,053
Likes: 0
Received 0 Likes
on
0 Posts
![Default](/forums/images/icons/icon1.gif)
Originally Posted by gripit
I realize that, but I just want to know if there is any harm in flushing with out running the engine besides the circumvention water running through the block.
Any harm? No. Any good? That depends on what you're trying to accomplish. What they are telling you is by doing that, you are not flushing the engine, only the exhaust. You're not harming anything but you aren't helping the engine, but it's not hurting it. If you have salt water in it, THAT could hurt it obviously.
Kind of like washing my car, but only the trunk and doors. Doesn't hurt anything, but doesn't help the rest of the car either.
![Big Grin](/forums/images/smilies/biggrin.gif)