225 V6 TEMP issue AGAIN !!!

[dompie99]

I've had this issue over and over for the past time i've had the engine rebuilt.
Last year was great, no temp issue ( finally )

This year, just came out of storage, I've installed a brand new pump outfit last year almost in mid year. I did not replace this year, I get the Pee running okay on the ears. water pressure has NEVER exceeded 7 to 8 PSI, I think these 3.0L V6 are prone to overheat.

I always run it on super, 45 to 1 oil mixed.

H E L PPpppppppp

[XstreamVking]

Merc? or....I have 2 mercs 3.0 225 and no overheat. Ever....

[dompie99]

yeap, it's a Merc.

[FMP]

When using the hose you should really use the cold not the hot water. Kidding

[mrichartz]

Is it on the muffs it's over heating or did you put it in the water too?

[XstreamVking]

Pressure is a lil low should be 15 wot. I would start with the poppet valve and t-stats. New impeller. Also check the sensor for the gauge and make sure it is really getting hot. Normal temp is 140(+-) overheat is 190(+-) Should have 130 deg t-stats.

[vnemous]

Both my X and 250 EFI run at about 8-9lbs wot and barely readable at Idle on gauge, I have to check smartcraft at idle to see any pressure:D Never overheated.

[Dave S]

Tripps was saying he had one..... bad /reused Orings on the heads... blowing water out of cooling. I have seen rotted water tubes... and wrong tube plastic thingy...

[bigshrimpin]

http://www.bbcboards.net/showthread.php?t=23837

[dompie99]

are you serious ?? Dammmm I was using hot water lollllllllllllllllllllllllllllllllllllllllllllll

[dompie99]

I was ridding on the water and the gauge went a little closer the 3/4 of the reading

[dompie99]

I've been chasing this thing over a year or two. Replaced everything possible, copper tube, grommet, popet valve, water pump ( three time more than two ) added a second water inlet tube to the Land and Sea nose cone
it had only one before, replaced Tstats with 138* before they were 143, . widened the water inlet under the nose cone....it pees alright on Idle and the temp raise slowly. Pulled the heads and replaced O-rings, checked for corrosion, warpness nothing of these late two. I am really P...O... can't replace more than what I've done so far.....even replaced temps senders unit ( both because I installed two thermometers ) compared with a infrared thermometer. the engine is running on the hose idle at 159* on both sides.

[Dave S]

If it is a Frankin motor ... make sure the PH/ adaptor plate match..... early ones crack.

[FMP]

Chucks of old impeller wedged in adapter with pebbles and poutine?

[Bunger]

Had a similar problem on the optimax on our bass boat. Low water pressure and overheating at idle. Ended up being leaking gasket between the mid and exhaust plate.