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  1. M

    Good reference site found

    Came across this site while doing research on props. Has alot of general technical info on boat performance, motor mounting, props etc. Image quality is poor but legible. Might be of interest to new as well as seasoned boaters. scroll to bottom of page for links to all 60+ pages.
  2. M

    Prop selection puzzle

    1992 Mariner 40HP Magnum currently has 10 1/8" dia 3 blade prop. Unsure of pitch as there is no marking anywhere on it. It does have cupped blades. Am trying to buy a spare/replacement prop but am confused by the listings here on iboats. If I enter the parameters in the selection windows I end...
  3. M

    Prop thrust washer inspection and removal

    Simple question with probably a simpler answer.<br />1992 40HP Mariner that I am doing routine service work on before the season begins here. Would like to know how to tell if the washer needs to be replaced and how do you get it off the propeller shaft. I have tugged, pulled and 'gently' tapped...
  4. M

    Poor mans trim tab question (see image)

    I am trying to correct a slight performance issue on a 14ft whaler style boat with a 40hp Mariner OB. Hole shot is great but have to keep motor trimmed IN all the way or boat porposes once on plane. Transom angle is only 8 degrees and motor has a fin on it. Without the fin the boat porposes ALL...
  5. M

    Overheat Switch Merc/Mariner 40HP 4 Cyl

    Can anyone tell me the difference between a Mariner 40HP 4 cyl and a Mariner 45HP 4 cyl ? I need a new overheat switch for the 40HP but have only been able to find a replacement for the 45HP (not thru dealers). The dealers won't or can't tell me if the two are compatible. I'm hoping someone on...
  6. M

    Charging voltage

    Have a 92 Mariner 40HP 4cyl ELPTO. The volt meter (dash) shows over 16V when running above 3000RPM. Drops to within "normal" range below 3000RPM. Can this damage the battery ? I have not checked actual readings with DVM yet. Ran the boat all summer with no ill effect (I think).
  7. M

    Water in Lower Unit - Mariner 40HP

    Upon winterizing the motor this past fall I found the lower unit 1/2 full of water, 1/2 full of oil. When I started the season it had new oil put in it. Where do I look for the source of the water. (I know the lake .... :D ) I will be replacing the water pump impeller soon so if there is...
  8. M

    Thoughts on 2004 Lund 1700 SS Insurance auction

    Came across a 2004 Lund 1700 SS side console boat for silent auction and would like any input you may have. Boat has an 18" x 1 1/2" gash thru outer skin above waterline on port side. Boat has been stripped of everything but steering wheel. All controls, seats, gauges, electronics etc are gone...
  9. M

    Thoughts on 2004 Lund 1700 SS Insurance auction

    Came across a 2004 Lund 1700 SS side console boat for silent auction and would like any input you may have. Boat has an 18" x 1 1/2" gash thru outer skin above waterline on port side. Boat has been stripped of everything but steering wheel. All controls, seats, gauges, electronics etc are gone...
  10. M

    Strange performance improvement

    40HP 4cyl mariner on a 14ft composite f/g fishing boat. This boat launches out of the hole (2 seconds)and typically ran 30-33 MPH all summer with 2 adults at WOT. Went out yesterday for a final day of boating/fishing before the snow comes and had something interesting happen. Was able to hit 44...
  11. M

    Decarb products in Canada ?????

    I have searched in vain for a product similar to the Seafoam discussed on this forum. Does anyone know of a product and where it can be purchased in Canada. None of the local marinas have ever heard of such a thing and the auto supply shops just tell me to use fuel stabalizer. What a joke. I am...
  12. M

    Starter cable length ... how long can I go ?

    I have a 40HP 4 cyl ELPTO Mariner. I want to move the battery in the boat for better weight distribution but will need to increase the cable lengths. The total length of the cable will be between 9 and 10 ft. Is a 4ga wire sufficient or do I have to go to the 2ga which is REAL big. These cables...
  13. M

    Low operating temp

    1993 Mariner 4cyl 40hp only runs at 90-100 degree F after running at 3/4 - full throttle for 30 minutes. Have installed a temp gauge and sending unit to factory port on power head. I checked the gauge accuracy before installing on the motor. The sender is located on the head between no2 and no3...
  14. M

    Low operating temp

    1993 Mariner 4cyl 40hp only runs at 90-100 degree F after running at 3/4 - full throttle for 30 minutes. Have installed a temp gauge and sending unit to factory port on power head. I checked the gauge accuracy before installing on the motor. The sender is located on the head between no2 and no3...
  15. M

    Steering Cable removal

    I have read thru the many post here on steering cables but I have a problem which is unique. I have a Mariner 40HP with tilt/trim. The steering is a rotary type with teleflex cable. When I try to loosen the coupling nut that secures the cable to the tilt tube on the motor, the whole tilt tube...
  16. M

    Is mounting motor like this OK ?

    I have a 1993 40HP mariner OB that has been fitted to a 14ft fiberglass whaler style boat. In order to align the cavitation plate with the hull bottom, the motor is sitting up off the top of the transon by about 1 1/4". The motor of course is bolted thru the transom at 4 spots but I am concerned...
  17. M

    First motor for rookie boater

    I have recently purchased a used 40HP Mariner O/B. I want to be sure that all of the "important" safety systems are operational (ie temp sensing, oil injection etc). Where can I go for direction on checking these systems. The motor started right up from cold when first inspecting it and ran...
  18. M

    Mysterious loose wire

    Found a loose wire under the cowling of my 1991 Mariner 40Hp. It is a 4cyl version. The wire seems to originate from the electrical box (I think)and the loose end is dangling around the #1 spark plug. Also noticed that beside the #1 spark plug is a blind tapped hole about 1/4" deep. Is something...
  19. M

    Two part foam

    Are there different types of 2-part foam for use in replacing the core foam in a moulded F/G boat? This is not just for flotation, it is a part of the structure of the boat. What do you recommend? I was thinking of the 2Ib density as mentioned elsewhere on this site. Where can I buy such a...
  20. M

    Waterlogged advise

    Perhaps someone can offer some advise on a fiberglass foam cored boat that seems to be waterlogged. The boat is similar in style to a boston whaler. I was thinking of cutting away the floor in panels, removing the old foam, pouring new 2-part foam in place and glassing the floor panels back in...
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