Go Back   TeamTalk > Maintenance Tips, How-tos and Refurbishing Topics > Engine / Drive Train

Reply
 
Thread Tools Display Modes
  #1  
Old 06-04-2013, 07:40 AM
SWGA Boater's Avatar
SWGA Boater SWGA Boater is offline
TT Enthusiast
 
Join Date: Oct 2012
Boat: Not a MasterCraft
Location: Southwest Georgia
Posts: 203
RW pump issues / help needed

Has anyone ever saw a new RW pump impeller that is bad? I replaced my impeller and boat seemed to run fine at idle in yard. Took to river and ran hot from start. No trash/ clogs could be found. Tried running on fake a lake. No water reach RW pump. Ok....trans cooler clogged. By passed it. Tried again. No water making it to exhaust only steam. Took out thermostat. Very little water is making it to the exhaust. Could the motor water pump be bad and not circulating water through engine? RW (new) bad and not creating suction to pull water? When I bypassed transcooler I pulled cover off RW pump. Water is reaching pump.

Any thoughts on what to try next? I have a new thermostat coming also....
Reply With Quote
  #2  
Old 06-04-2013, 08:48 AM
CantRepeat's Avatar
CantRepeat CantRepeat is online now
 
Join Date: Jul 2008
Boat: 06 X30
Location: Roll Tide!!
Posts: 8,693
Did you look for an obstruction from the hull pick up to the raw water pump? Is the hose still firm or did it possible collapse on the inside?
__________________
Tim
Gone, surfing.
Reply With Quote
  #3  
Old 06-04-2013, 10:10 AM
Rossterman's Avatar
Rossterman Rossterman is offline
MC Fanatic
 
Join Date: May 2012
Boat: 2001 prostar 205V
Location: Westcoast
Posts: 703
Read there are 2 different legnths of impellers for the rw pump . 1 7/8" & 2". A few boaters on other forums put in the shorter one by mistake causing poor priming and symptoms like you mention.mverify the depth of the housing and impeller legnth to make sure you didnt get the shorter one. Needs to have no end clearance to the cover and should be flush when all the way seated.
Reply With Quote
  #4  
Old 06-04-2013, 11:43 PM
SWGA Boater's Avatar
SWGA Boater SWGA Boater is offline
TT Enthusiast
 
Join Date: Oct 2012
Boat: Not a MasterCraft
Location: Southwest Georgia
Posts: 203
Thanks for the suggestions. I am leaning toward the wrong impeller as all I did was swap for preventative maintenance. I had a hard time finding the correct one. The rw pump has been changed at some point. I talked with DIM extensively today and think I have the correct one on the way. Fingers crossed. Pump is a Jabsco/Volvo-Penta, but very similar to Johnson or Sherwood pumps. Regular Indmar impeller is what I have but DIM is stating the nonpriming is due possible to the size issue described above.

I'll update after I swap the impeller on Thursady or Friday. Meanwhile I have some electrical/rewiring to do....
Reply With Quote
  #5  
Old 06-06-2013, 12:50 AM
SWGA Boater's Avatar
SWGA Boater SWGA Boater is offline
TT Enthusiast
 
Join Date: Oct 2012
Boat: Not a MasterCraft
Location: Southwest Georgia
Posts: 203
Pulled my newly replaced impeller tonight. Looks the same but under close inspection the new is about 1/8 inch shorter than the old--just as described above and with DIM over the phone. Fingers crossed this was causing my nonpriming/overheating issue. New impeller should arrive tomorrow or Friday. I hope it is the one that I need. Will update thread after comparing and swapping out the new impeller.
Reply With Quote
  #6  
Old 06-09-2013, 10:14 PM
SWGA Boater's Avatar
SWGA Boater SWGA Boater is offline
TT Enthusiast
 
Join Date: Oct 2012
Boat: Not a MasterCraft
Location: Southwest Georgia
Posts: 203
New raw water pump impeller installed and worked fine. Primed right up. Hard to believe the 1/8 inch shorter pump was causing the nonpriming/overheating issue. I replaced thermostat also and I let the boat run in the yard for about 20 minutes and did not have an issues. Thanks again for the suggestions on the impeller being too short!

Now on to electrical gremlins....
Reply With Quote
  #7  
Old 06-09-2013, 11:01 PM
Rossterman's Avatar
Rossterman Rossterman is offline
MC Fanatic
 
Join Date: May 2012
Boat: 2001 prostar 205V
Location: Westcoast
Posts: 703
Gotta love this forum, eh?
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


All times are GMT -4. The time now is 11:28 AM.