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Yamaha F115 Trim Reservoir Thread Stripped

Old 12-02-2020, 03:59 PM
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Default Yamaha F115 Trim Reservoir Thread Stripped

My trim was making noise and seemed to lack power on my 2008 Yamaha F115. Did a little investigating and one of the rams is leaking so I had low fluid. I will be replacing the seal and cap o-ring soon. Another issue is that the threads on the plastic reservoir are partially stripped. I can't get the plug to seal off completely. The new reservoir is 172.00. Any suggestions? Is it an easy replacement if I go that route.

Thanks!
Old 12-02-2020, 06:00 PM
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MDT
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Go to SIM's web ( Yamaha Outboard Parts and Products-Shipped Fast-So You Can Spend More Time On the Water (simyamaha.com)), Select Parts, look up your F115 in the model index, go to Power Trim Tilt Assembly 1. For my F115 it is (USE PARTS DIAGRAMS TO ORDER PARTS (simyamaha.com)), it is part 23, "Plug, Reservoir" . Make sure you order the O-ring also, part 24. BO, RESERVOIRBPODY, RESERVOIRBODY, RESERVOIRBODY, RESERVOIR

Last edited by MDT; 12-02-2020 at 10:10 PM.
Old 12-03-2020, 04:59 AM
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Originally Posted by MDT View Post
Go to SIM's web ( Yamaha Outboard Parts and Products-Shipped Fast-So You Can Spend More Time On the Water (simyamaha.com)), Select Parts, look up your F115 in the model index, go to Power Trim Tilt Assembly 1. For my F115 it is (USE PARTS DIAGRAMS TO ORDER PARTS (simyamaha.com)), it is part 23, "Plug, Reservoir" . Make sure you order the O-ring also, part 24. BO, RESERVOIRBPODY, RESERVOIRBODY, RESERVOIRBODY, RESERVOIR
Thanks. I have all the parts numbers and ordering info. I am more asking the best approach to install or fix.
Old 12-03-2020, 11:03 AM
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My suggestion would be to remove it from the motor and repair and purge it on a work bench. It is much easier that way. Do you have the special spanner wrench for removing the caps? Stick with the trim and tilt pistons (they are relatively straight forward) and avoid opening up the pump assembly (it can be a challenge). I've F115 twins and several years ago the Starboard started leaking and I had a fluid puddle under the lower unit. My initial analysis was that the fluid was coming out of the seal on the right trim piston (the one under the reservoir) so I pulled it and replaced the seals only to find that the leak was actually from under the O-ring in the reservoir cap. So...look closely.
Old 12-03-2020, 11:23 AM
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Before buying a new reservoir, you could try threading it to the next larger size. Then get a matching plug & o-ring from a plumbing supply house.
Old 12-03-2020, 12:15 PM
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Originally Posted by Cobia 217 View Post
Before buying a new reservoir, you could try threading it to the next larger size. Then get a matching plug & o-ring from a plumbing supply house.

Can you elaborate or be more specific?
Old 12-03-2020, 12:17 PM
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Originally Posted by MDT View Post
My suggestion would be to remove it from the motor and repair and purge it on a work bench. It is much easier that way. Do you have the special spanner wrench for removing the caps? Stick with the trim and tilt pistons (they are relatively straight forward) and avoid opening up the pump assembly (it can be a challenge). I've F115 twins and several years ago the Starboard started leaking and I had a fluid puddle under the lower unit. My initial analysis was that the fluid was coming out of the seal on the right trim piston (the one under the reservoir) so I pulled it and replaced the seals only to find that the leak was actually from under the O-ring in the reservoir cap. So...look closely.
i do not have the tool but I have heard you have to have it and the caps are easily damaged. Do you know where to purchase the tool?
Old 12-03-2020, 12:57 PM
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Originally Posted by Cobia 217 View Post
Before buying a new reservoir, you could try threading it to the next larger size. Then get a matching plug & o-ring from a plumbing supply house.

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Old 12-03-2020, 01:09 PM
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Originally Posted by Fwpratt View Post
My bad. I was thinking it was an internal plug and not a cap. In which case use a couple of wraps of teflon pipe tape over the threads, being careful not to go over the hole.
Old 12-03-2020, 06:11 PM
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I purchased my tool from Andy at SIM. I essentially purchase all my Yamaha stuff from Andy and pretty much helped put his kids through college LOL. Here is the link for the tool: Trim and Tilt Tools (simyamaha.com) Couple of thoughts: 1.) are the threads on the reservoir so bad that a new cap wouldn't work? I would try a new cap and O-ring before changing out the reservoir itself. 2.) Also, I would be real careful putting Teflon tape on the threads. If you were to get any pieces of that stuff in the reservoir it will immediately plug up a valve in the pump unit. Every shop manual on Trim/Tilt pumps talks about being careful and clean....don't get any contamination in the fluid as it will cause the system to malfunction.

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