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Old 08-08-2013, 04:25 AM   #31
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here is the fuel pump look closely at the end of the arm where it is worn...
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Old 08-08-2013, 12:35 PM   #32
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That is worn. Typically a mechanical fuel pump mounts to the engine block and is lubricated by the engine oil. In you case this vintage of the 7.4 was intended for fuel injection for street use. When mercruiser but a carb on it they need decided to use a mechanical fuel pump and mounted it on the raw water pump. Do you know if this section gets filled with a lubricant? If so I guess you need to maintain it's level to prevent this type of wear again. If not you get what you get.

Anyhow good luck.
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Old 08-08-2013, 01:29 PM   #33
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makes sense Mike.. there was no oil or lubricant in there and not sure where or how it is filled.. probably just stupid on my part.. I will look at the pump and see if there is a fill point but there is/was no lubricant there.. again, probably my stupidity..
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Old 08-08-2013, 05:11 PM   #34
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Wasn't sure myself and did a quick google. There is a plug on the unit to check and fill the oil. Sounds like the pump must be removed to do so. Therefore do this service when changing impeller.

Do you have a picture of the pump housing? Sound have a plug where fuel pump attaches.
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Old 08-08-2013, 05:45 PM   #35
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As I can tell the pump takes mercruiser gear lubricant.. same as the outdrive? anyway must be filled.. when the fuel pump goes it leaks into the housing thinning out the oil? the friction disipates whats in there and kills the bearings.. anyway this is from iboats.com.. so here is the reason for my issue I think.. ignorance on my part, costly too.. anyway is this correct or sound reasonable? I will get pics when I get down there to take it apart.. probably not til the rain stops or the parts are here.. dont want to leave it open..

Here is a post from BoaterEd.com
To replace the lube remove both screws. The bottom screw will have a magnetic tip to attract the metal parts from wear. Once you have it drained put the bottom screw back in place. Fill the pump from the top hole until the oil is even with the top screw hole.

.. apparently it takes 2-3 ounces of gear oil
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Old 08-08-2013, 05:53 PM   #36
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Sounds right to me.

BTY: don't sell yourself short I bet most folks with this same set up don't know about the need to check to ensure there is oil here. Once you get the pictures it might be helpful to other to make a new post letting them know.
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Old 08-08-2013, 06:14 PM   #37
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Thanks Mike!! Yea I will do that when I get the parts in and get it together.. they say by next wednesday I should have them, hoping so, the regatta on the river I dock on is next weekend I think.. would hate to be without my cruiser for the fun..

Also I joined the facebook group a while back and just realised its the same group as here.. or from this site..
I have posted pics of some of the adventures we are having this year there.
Anyway cant thank u enough!
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Old 08-15-2013, 07:22 PM   #38
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[ATTACH][/ATTACH][ATTACH][/ATTACH][ATTACH][/ATTACH]

Here are pics of the bad raw water pump... u have to look in there close but, its completely broke up.. the bearing is split in two pieces.. the boat ran like this but no high rpms.. this also caused it to kill the fuel pump.
So, lesson learned for first time owner of this motor.. that raw water pump has a resevoir screw and needs to checked periodically for gear lubricant.

Installed the new pump, filled it.. boat runs good now.

Stupid question here.. what does the SCR stand for?
Thanks!
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Old 08-15-2013, 08:58 PM   #39
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Glad to here you're running again.

SCR: Sports Cruiser
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