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still overheating

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Re: still overheating

by transomstand » Dec 03, 2012 10:27 pm

fla.viper wrote: im not sure what a poppet valve is, what it looks like, or where it is. when it drops the pressure about 10 psi, does that mean it regulates the pressuer at constant 10 psi, or does it drop it 10 psi from where it is at 1800 rpm? does the pressuer change with rpm? what pressuer should i have while runninig? i dont know if it makes a differance, but here in florida most of us dont run t-stats.
tx mike
It drops it about 10 psi, to prevent excess pressure at high rpm. Thermostats regulate pressure in a stock motor, and should never be removed. Having no thermostats makes it extremely difficult to keep the block full.

Re: still overheating

by varmint1 » Dec 03, 2012 8:41 pm

When your running the lwp also forces water to the engine.

[ Post made via iPhone ] Image

Re: still overheating

by fla.viper » Dec 03, 2012 8:05 pm

transomstand wrote:The poppet valve opens at about 1800 rpm, should drop the pressure about 10 psi
im not sure what a poppet valve is, what it looks like, or where it is. when it drops the pressure about 10 psi, does that mean it regulates the pressuer at constant 10 psi, or does it drop it 10 psi from where it is at 1800 rpm? does the pressuer change with rpm? what pressuer should i have while runninig? i dont know if it makes a differance, but here in florida most of us dont run t-stats.
tx mike

Re: still overheating

by transomstand » Dec 03, 2012 7:41 pm

The poppet valve opens at about 1800 rpm, should drop the pressure about 10 psi

Re: still overheating

by fla.viper » Dec 03, 2012 7:33 pm

the water pickup seal worked. i now have 10-11 psi at idle. it drops to 7 as i rev it. not sure why? ive ordered a whole waterpump assemebly. might as well start with all new parts. ill have to weight till saturday for a test run, it gets dark at 6:00 when i get out of work. thanks for all the help and suport, mike

Re: still overheating

by transomstand » Dec 03, 2012 4:06 pm

fla.viper wrote:think i may have found the problem. the rubber seal in the waterpump,
They never listen to me :dunno: :naughty:

transomstand wrote:Change the base too. Make sure the rubber seal is in the top of the water pump housing. Guy probably just put an impeller in it, which is a waste of time.

Re: still overheating

by fla.viper » Dec 03, 2012 3:05 pm

think i may have found the problem. the rubber seal in the waterpump, where the pickup tube goes in is completely missing. i found this by compareing each componit of my old unit, and the new deffective one. im on my lunck break, so i wont reasembl and test till after 6:00, let u know what hapens.
mike

Re: still overheating

by transomstand » Dec 03, 2012 11:21 am

Replace EVERYTHING with new Merc stuff first.

Re: still overheating

by RussF » Dec 03, 2012 9:07 am

I use Merc stuff for that

Re: still overheating

by fla.viper » Dec 03, 2012 8:41 am

i have to assume the problem is in the lowerunit. i hooked a garden hose directly to the water intake fitting on the water pump to flush the salt water from the motor. i expected to see better pressuer, but no. still 2-5 psi. the water hose puts out more than that. my next plan is to completely replace every thing that has to do with the waterpump. should i get one from mercury dealer, or is there another manufactuer produceing a better unit? tx mike

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