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Old 11-22-2015, 10:27 AM   #1
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question about my 135hp Ford

I'm trying to learn a little about the engines on my new boat. I have taken a few pictures of a fitting on my boat's 135 hp Ford engines (1987). I have no idea what it is. It is on the front of the engine near what I assume is the fresh water pump. I notice that when I turn the nut on the cap fitting, the bolt turns as well. What's up with that? Should I be alarmed? Should I ask for a refund? Nothing is leaking from the fitting, but I'm still curious.


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Old 11-22-2015, 10:53 AM   #2
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I believe the nut you are turning is the tightening nut on an expansion plug. We have a rubber boot with a hose clamp that serves the same purpose. Call American Diesel and get the correct fitting/cap/boot would be my suggestion. It's an off the shelf item.
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Old 11-22-2015, 10:59 AM   #3
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It may be an internal expansion plug like a rubber garboard plug. Some 135s have external caps over that fitting, I think is's just a left-over feature from the engine's truck motor origin. That would have been the inlet to the water pump from the lower radiator hose.
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Old 11-22-2015, 12:10 PM   #4
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Yes. I have a rubber boot as well. Call American Diesel and see if this needs to be replaced.

http://americandieselcorp.com

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Old 11-22-2015, 12:15 PM   #5
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Yes. I have a rubber boot as well. Call American Diesel and see if this news to be replaced.

American Diesel Corp

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Where is the raw water pump on your engine? Or is that the raw water pump under the pully, in which case the question is where is the fresh water pump?
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Old 11-22-2015, 12:25 PM   #6
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Larry; what does the other end of your belt tensioner look like?
You make it or acquire it?
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Old 11-22-2015, 12:33 PM   #7
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That rubber expansion plug is a common plumbing fitting used to temporarily or long term plug up various pipes. During the last conversation with Bob Smith that I had about this fitting many years ago he said that they were now recommending the expansion plug as being a more robust answer to blocking that unused pipe than the rubber boot that had been used earlier.
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Old 11-22-2015, 12:43 PM   #8
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What you have is a rubber expansion plug that blocks off the unused part of the coolant circulation pump. According to American Diesel it is the PREFERRED WAY to close off this port because it is much more reliable than the "cap". Plus when the cap fails it usually does so suddenly and the coolant empties very quickly. I replaced my original "caps" with the plugs and I can say that the end of the old style cap is very thin.

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Old 11-22-2015, 01:14 PM   #9
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What you have is a rubber expansion plug that blocks off the unused part of the coolant circulation pump. According to American Diesel it is the PREFERRED WAY to close off this port because it is much more reliable than the "cap". Plus when the cap fails it usually does so suddenly and the coolant empties very quickly. I replaced my original "caps" with the plugs and I can say that the end of the old style cap is very thin.

Ken

That is good advice. I'll look into that. I have to replace the oil coolers this year and inspect the heat exchanger so will probably replace the coolant at the same time. That would be a good time to replace the end cap.


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Old 11-22-2015, 02:06 PM   #10
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Larry; what does the other end of your belt tensioner look like?
You make it or acquire it?
Looks like he got smart and changed his tensioner over to a turnbuckle.
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Old 11-22-2015, 02:26 PM   #11
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Greetings,
Why not keep the cap and put a rubber plug over it? Belt and suspenders. I'd try Lowes or Home Despot for a generic rubber cap.
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Old 11-22-2015, 02:33 PM   #12
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Actually, in this case how about the internal AND an external cap? Redundancy?
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Old 11-22-2015, 03:00 PM   #13
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Question well covered and answered correctly, nothing to add but y'all have a great day!
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Old 11-22-2015, 03:45 PM   #14
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Larry; what does the other end of your belt tensioner look like?
You make it or acquire it?
Old school from my sailing days. The turnbuckle ends are called an aircraft or compression fork or jaw to jaw. You have to watch the cooling fin clearance on the alternator against the turnbuckle. Ted on OC Diver has a new school set up on his refit which is definitely worth a look.
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Old 11-22-2015, 06:42 PM   #15
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You have to watch the cooling fin clearance on the alternator against the turnbuckle.
Thanks Larry, the clearance was what I was wondering about.
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Old 11-22-2015, 06:54 PM   #16
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Thanks Larry, the clearance was what I was wondering about.
The turnbuckle is shorter than the standard bracket which means a smaller belt which got the tab on the alternator higher and closer to the engine.
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Old 11-22-2015, 09:48 PM   #17
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Ooooooohhhhh I LIKE that!
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