MarineEngine.com - Your online store for all types of marine engines and boat parts.
PHONE ORDERS
Monday - Friday
9:00 AM - 5:00 PM EST
Click for TOLL-FREE Number
Online Checkout
Special $9.95 Flat Rate Shipping
(800) 209-9624 | Home | Contact | Shipping | Returns | Cart View your shopping cart.
Part Number Search
Shop by engine/drive part number.
Original & matching parts for sale.
Manuals & Accessories
Shop by description, item number
or manufacturer's model number.
Boat Repair Forum Boat Repair Forum   Boat Video Gallery Video Gallery
   
Results 1 to 2 of 2
  1. #1
    Join Date
    Aug 2008
    Location
    marietta, ga, usa
    Posts
    5

    Default Problems with Prestolite trim pump

    I need an exploded parts illustration for an old style Prestolite power trim pump from my 1977, 4 cylinder Mercruiser (4.3l). This is the old style high pressure, low volume (round motor, rectangular reservoir) pump used with the smaller diameter rams. I took it apart to troubleshoot a motor problem (which is fixed) and disassembled the pump to clean it at the same time. When I reassembled the pump and valves, the "down" side wouldn't pump fluid at and then I adjusted the pressure screws and now it pumps fluid in spurts but not much volume. The "up" side works fine and puts out a strong solid stream of fluid so I know the gears are still good. If I run down the adjustment screw any more on the "down" spring, there won't be enough threads left to hold the lock nut. I have Clymer and Seloc manuals but neither give a breakdown of the pump. I have access to a high pressure hydraulic test set but need to get the "down" side pumping first. Any help is appreciated. Thanks, SG

  2. #2
    Join Date
    Aug 2006
    Location
    SW Ohio, USA
    Posts
    10,329

    Default Re: Problems with Prestolite trim pump

    Not enough fluid in the system, air in it, dirt in the system or worn seals?

Similar Threads

  1. Just replaced Trim Pump Will not trim down
    By big_chief in forum Mercruiser Sterndrive Forum
    Replies: 5
    Last Post: 12-17-2009, 07:50 PM
  2. Trim problems and starter problems
    By shagbert44 in forum Mercury Mariner Outboard Archive
    Replies: 2
    Last Post: 08-31-2009, 04:27 PM
  3. Power trim pump problems
    By super440 in forum Volvo Penta Gas Archive
    Replies: 4
    Last Post: 06-20-2009, 08:52 PM
  4. Prestolite pump vent sealwasher
    By ants in forum Mercruiser Sterndrive Archive
    Replies: 3
    Last Post: 05-21-2008, 12:24 AM
  5. Tilt trim pump problems
    By muccu in forum Mercury Mariner Outboard Archive
    Replies: 1
    Last Post: 07-23-2007, 12:39 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •