'72 merc 1150 water pressure reading

[monk-monk]

tried to dig this up from FAQ's but couldn't find the article, i just installed a water pressure gauge and was wondering what the optimal readind should be and what is considered to low water pressure. what PSI readings should i have?

 

[jason1150]

Re: '72 merc 1150 water pressure reading

I just seen this the other day, http://forums.iboats.com/showthread.php?t=224749&highlight=1150+water+temp hope this helps, J

 

[hkeiner]

Re: '72 merc 1150 water pressure reading

I don't have the OEM shop manual for your particular motor so I can't look up the specs. However, it is a good idea anyway to replace the impeller at the same time as installing a water pressure gauge. This allows you to determine the "normal" pressure readings for the motor at various RPMs. Once you know this, you can monitor the guage to see if the readings drop below "normal" , indicating that the impeller is starting to fail.

 

[Chris1956]

Re: '72 merc 1150 water pressure reading

Monk-monk, The inlines do not have too much water pressure. At idle the gauge will hardly move. At cruise you will see 5-10PSI.

Conversely, my Johnny has 30+PSI at high speed.

 

[Scaaty]

Re: '72 merc 1150 water pressure reading

I wouldn't worry much on pressure..but ya do need volume. Like said, new impeller. What ya get, is what ya get..