Propeller Ventilation Caused by $3 Part Deterioration

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Author Topic:   Propeller Ventilation Caused by $3 Part Deterioration

Richard Shears posted 09-03-2014 04:11 PM ET (US)
Several months ago, I posted an [article about propeller ventilation problems] I was having with my Mercury 150 FOURSTROKE [not-Verado model]. After I hit 3000 RPM the propeller would break loose. I was running at a high RPM and low speed. I received a lot of feedback ranging from lowering the engine to checking the hull. I even changed to a stainless steel propeller, which solved 70% of the [ventilation]. I decided to live with the problem, as Mercury could not help me and I had already spent over $1,000 trying to find a remedy.
My good friend, who also had the same engine but bought it six months after mine, just ran into the SAME problem. It turns out that the [cause] is the "propeller bore sleeve"--a $3 part that eventually deteriorates over time. It directs the exhaust through the hub. When it fails, the exhaust escapes around the propeller and thus it ventilates. This has been a long been a long and expensive diagnosis.
I hope this [information] will help others that own the Mercury 150 FOURSTROKE [not VERADO]. I am sure the part will eventually fail for all that have the engine.
martyn1075 posted 09-03-2014 07:46 PM ET (US)
If two people have the same [failure or problem] within months on a new engine. you [are] right: I'm sure many others will likely run into it. It sounds like it might turn out to be a recall-part in a batch of motors. I'm am wondering if your warranty would cover this for you now that you have gone and found out what Mercury should have done for you.
I am curious: how many hours have both of you have logged on your new motors?
jimh posted 09-03-2014 10:22 PM ET (US)
Richard--Many thanks for this information. It will be very valuable to all owners of the Mercury 150 FOURSTROKE. I think your prediction may be correct: many owners of the Mercury 150 FOURSTROKE may be experiencing propeller ventilation problems and not realize the cause is the deterioration of the prop bore sleeve or propeller bore sleeve. That the remedy is to replace a $3 part is wonderful.
I added a hyperlink to your original article that points to this new thread so that readers of that prior article will be informed of this remedy for the problem of propeller ventilation of the Mercury 150 FOURSTOKE. I also added a hyperlink in this thread to point back to the original thread.
Is the defect in the Mercury prop bore sleeve used on the 150 FOURSTOKE due to deformation or melting of the propeller bore sleeve due to high temperature in the exhaust gas stream? Is the prop bore sleeve made of plastic? Is it a thermal-plastic molded part?
Richard Shears posted 09-16-2014 06:57 PM ET (US)
My engine has 800 hrs. My buddy is right behind me.
Both of us heard the ventilating and when we inspected the prop out in the ocean, we both noticed a piece of plastic
protruding from the hub. I thought it was something I picked up and never thought twice about it as it was easily removed.
We now have about a half dozen backup.
It is easily replaced...just too bad that Mercury could not figure it out. A lot of time and money went into the diagnosis.
Hope this helps others.
Richard Shears posted 09-16-2014 06:59 PM ET (US)
I will check on the type of plastic used and re post later.
It did not look like it melted.....just broke apart from what we could tell.
jimh posted 09-24-2014 02:05 AM ET (US)
[Thread was revived to change topic to something completely different from the repair of the Mercury engine propeller bore sleeve. I sent the article back to its author and invited him to start a new thread on his new topic.]
RevengeFamily posted 09-24-2014 06:30 AM ET (US)
Wow. What a bummer. For the price we pay for outboards, you would think manufacturers used titanium for all the pieces that make the entire machine.
Any chance you could post a photo of the defective plastic piece with a link to it?
Norm

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Author	Topic: Propeller Ventilation Caused by $3 Part Deterioration
Richard Shears	posted 09-03-2014 04:11 PM ET (US) Several months ago, I posted an [article about propeller ventilation problems] I was having with my Mercury 150 FOURSTROKE [not-Verado model]. After I hit 3000 RPM the propeller would break loose. I was running at a high RPM and low speed. I received a lot of feedback ranging from lowering the engine to checking the hull. I even changed to a stainless steel propeller, which solved 70% of the [ventilation]. I decided to live with the problem, as Mercury could not help me and I had already spent over $1,000 trying to find a remedy. My good friend, who also had the same engine but bought it six months after mine, just ran into the SAME problem. It turns out that the [cause] is the "propeller bore sleeve"--a $3 part that eventually deteriorates over time. It directs the exhaust through the hub. When it fails, the exhaust escapes around the propeller and thus it ventilates. This has been a long been a long and expensive diagnosis. I hope this [information] will help others that own the Mercury 150 FOURSTROKE [not VERADO]. I am sure the part will eventually fail for all that have the engine.
martyn1075	posted 09-03-2014 07:46 PM ET (US) If two people have the same [failure or problem] within months on a new engine. you [are] right: I'm sure many others will likely run into it. It sounds like it might turn out to be a recall-part in a batch of motors. I'm am wondering if your warranty would cover this for you now that you have gone and found out what Mercury should have done for you. I am curious: how many hours have both of you have logged on your new motors?
jimh	posted 09-03-2014 10:22 PM ET (US) Richard--Many thanks for this information. It will be very valuable to all owners of the Mercury 150 FOURSTROKE. I think your prediction may be correct: many owners of the Mercury 150 FOURSTROKE may be experiencing propeller ventilation problems and not realize the cause is the deterioration of the prop bore sleeve or propeller bore sleeve. That the remedy is to replace a $3 part is wonderful. I added a hyperlink to your original article that points to this new thread so that readers of that prior article will be informed of this remedy for the problem of propeller ventilation of the Mercury 150 FOURSTOKE. I also added a hyperlink in this thread to point back to the original thread. Is the defect in the Mercury prop bore sleeve used on the 150 FOURSTOKE due to deformation or melting of the propeller bore sleeve due to high temperature in the exhaust gas stream? Is the prop bore sleeve made of plastic? Is it a thermal-plastic molded part?
Richard Shears	posted 09-16-2014 06:57 PM ET (US) My engine has 800 hrs. My buddy is right behind me. Both of us heard the ventilating and when we inspected the prop out in the ocean, we both noticed a piece of plastic protruding from the hub. I thought it was something I picked up and never thought twice about it as it was easily removed. We now have about a half dozen backup. It is easily replaced...just too bad that Mercury could not figure it out. A lot of time and money went into the diagnosis. Hope this helps others.
Richard Shears	posted 09-16-2014 06:59 PM ET (US) I will check on the type of plastic used and re post later. It did not look like it melted.....just broke apart from what we could tell.
jimh	posted 09-24-2014 02:05 AM ET (US) [Thread was revived to change topic to something completely different from the repair of the Mercury engine propeller bore sleeve. I sent the article back to its author and invited him to start a new thread on his new topic.]
RevengeFamily	posted 09-24-2014 06:30 AM ET (US) Wow. What a bummer. For the price we pay for outboards, you would think manufacturers used titanium for all the pieces that make the entire machine. Any chance you could post a photo of the defective plastic piece with a link to it? Norm