acceptable wear on seawaterpump or not ?

[aerobat]

i,m replacing the impeller on my 2006 5.0MPI B3 drive and i,m not sure if my gen7 seawater pump is good or if i,m asking for problems mid seaon .

last season no low water alarm and no overheating but visible scoring on the pump housing .

i,m aware of aftermarket wearplates but they are not avsilable in germany , a new pump is expensive as hell here.

whats your opinion ?



best regards

 

[Bondo]

Ayuh,..... That's Bad, ya need a new one,.....

 

[alldodge]

If it was mine I would get a wear plate, but I also can get one easy enough. In your case, its either go with it, or see if a machine shop can mill a couple thousands off.

What about going to a machine shop and asking them to make a wear plate? Might be worth it

 

[aerobat]

giving it to a machine shop for milling the grooves off and resurfacing it will have no adverse effects ?

in germany the backplate alone is over 350 $ ...

 

[aerobat]

i gave it now to a machine shop and they will resurface it , i will post you the result !

 

[alldodge]

Should work out fine

 

[scoflaw]

Still have the inner surface to deal with though

 

[alldodge]

Still have the inner surface to deal with though

I would bet your machine shop could make a plate to go inside. It needs to be thin, guessing around 0.015 (.4mm). The rear plate could be easy also using the pump as a guide.

 

[aerobat]

the scoring on the inner side appears to be far less so i will risk to leave it as it is .

its a shame that there are no rebuild kits in germany - they prefer to sell you a new pump...

 

[aerobat]

thats the work of the machine shop and i,m highly impressed of their job !

 

[alldodge]

Yes, nice job what a lathe can do. Can only do that a couple times before it gets to thin for use

 

[aerobat]

i reinstalled the pump and the boat runs like a champ !

what still bothers me a little bit are the for my taste bit low water pressures ...

at idle with boat in the water and cold start i get 1.16 psi on the smartcraft . with a fully warmed up engine the pressure goes down to 0.87 psi at idle

at high rpm,s i get no more than 3.5 psi .

that said i have zero issues with the boat , no alarms or signs of overheat and the engine has plenty of power .

i can let it idle forever and it will sit at 153 deg on smartcraft . forcing it WOT and 4800 rpm,s i never saw more than 156 deg . both manifolds are equally warm , the risers stay pretty cool .

i have the sensor at the power steering cooler and since it shows zero with engine off and the pressures change at different rpm,s i guess the sonsor works correctly .

i heared of bravoitis but since the boat gives zero issues or alarms i maybe overthink a pretty normal situation ?

what are the thresholds for water pressure where smartcraft would throw an alarm ?

best regards

 

[alldodge]

This is from maual 36

The seawater pump sensor measures water inlet pressure or water block pressure. It is located at the seawater pump inlet hose. Normal pressure ranges are 7-34 kPa (1-5 psi) at idle and 48-117 kPa (7-17 psi) at WOT. To check if sensor is within range, the diagnostic tool reading with key ON should be approximately 0.

A malfunction of the seawater pump sensor will set the fault of Seapump CKT Hi, Seapump CKT Lo or Seapump PSI Lo.

 

[aerobat]

thanks alldodge ! i think merc changed 2002 or 2003 the seawater sensor from the pump to the servo cooler with obviously other pressure specs .

do you have a manual with specs for newer engines ?

 

[alldodge]

My 2002 version list what is posted above
My 2006 version says it must be checked with a scanner and engine off must read 0

 

[aerobat]

do i understand you correct :

the 2006 version does not provide any numbers of nominal value for waterpressure ?

 

[alldodge]

do i understand you correct :

the 2006 version does not provide any numbers of nominal value for waterpressure ?

Correct, no numbers listed in my copy

 

[aerobat]

ok , thank you much !

i also never found official spec numbers or alarm thresholds for the later models regarding water pressure .

as long as no alarms or overheating occour i will leave it alone .

 

[alldodge]

IMO those water pressure switches (sensors) are the worst thing they ever add, because they are not reliable and have a high failure rate, and expensive. If they would last I would like them more. I installed a gauge to watch mine

 

[aerobat]

the idea of this sensor is not bad - when you burst a hose , blow the impeller or clog the intake while underway you should get an immediate alarm before further bad things happen .

i agree with expensive sensors and failures of the sensor itself .

just of interest : when you remove the sensor and install a gauge - will that not result in an alarm on a guardian controlled engine ?