Logo
FULL SITE MENU

H2o pump looses prime

Prodriver1067

Prodriver1067

Member
RKL-24 (62 Johnson 40hp) Excellant cond. hasn't run since 89 so I recond everything except pistons rings (88psi comp). Problem, have new pump impeller, plate, tube grommets, seals, o-rings, T-stat and housing, pump housing looks to be in good shape so it wasint replaced. engine runs great but pump will only prime at higher rpm (25-3000) then it will hold prim till low rpm for a while or shut off, then have to reprime again. hesitating to buy a new housing due to cost would like to reline but cant find the part, is there a possible problem I'm missing? took it all apart just to do it and found nothing wrong, everything looks new, cuz it is. any help is appreciated. :cool:
 
Are you getting any water/spray discharge at all at slow speed? Normal condition is a light spray when thermostat is closed (idle speed). You do have it in the lake, don't you?
 
Water must be 8" above the impeller in a tub.-----Standard muffs do not work.----Thermostat must be complete.----Best test in the lake as stated.
 
fdrgator said:
Are you getting any water/spray discharge at all at slow speed? Normal condition is a light spray when thermostat is closed (idle speed). You do have it in the lake, don't you?
Click to expand...


It seems to give a mist but doesn't increase when the thermostat opens, I have to rev it to get more discharge (prime) or it will overheat. once its primed ive had it run for an hour with no problem, if I shut it off process starts over again (lost prime) its in a 50gal water trough in the driveway, water is 6in above upper inlet.
 
This is a long shot, but maybe...... There are two water tubes. One for "water up" and one for "water return down". "Water up" has a spray hole in the side. If you swap them, you will have a cooling problem.
 
fdrgator said:
This is a long shot, but maybe...... There are two water tubes. One for "water up" and one for "water return down". "Water up" has a spray hole in the side. If you swap them, you will have a cooling problem.
Click to expand...

I saw the hole didint think nothing of it but if your right that could be the problem, cold have been switched, now the sucky part, take it apart again.
 
Back
Top