Impellar Check

M

medic

Petty Officer 2nd Class
Joined
May 18, 2003
Messages
111
I have a 1982 OMC 2.5 liter (4 cyl) with OMC Stearndrive. How do I go about checking my impellar? It has not overheated but since I rebuilt my carb I am wanting to go ahead and check things for preventive maintanence. Also, what should I expect normal operating temp to be?<br /><br />I don't have a manual yet, it may be some time before I can get one and I am hoping to be on the water this weekend. Any ideas where I can get online instructions for replacing the impellar, if I indeed have to?<br /><br />Can I simply hook it to water with muffs and let it idle to see if temp maintains a constant temp?<br /><br />Have to see if I have the model number wrote down somewhere, but the serial number is J743145.<br /><br />medic
 
D

danthern

Petty Officer 1st Class
Joined
May 28, 2003
Messages
217
Re: Impellar Check

If I'm not mistaken (and I may be), using the muffs or hose is not a reliable way to check your impeller. The drive has to be in water. I was able to check mine by removing the prop and situating the drive in a large trough that I use to water my horses. Disconnect the inlet hose and run the motor checking to see that water is being pumped through. Depending on whether its a cobra or a stinger, the replacements are different. Relatively simple on the cobra, have to pull the drive on a stringer. Hope this helps. Double check me, there are certainly more knowledgeable guys than me on the forum.
 
C

crazy charlie

Vice Admiral
Joined
May 22, 2003
Messages
5,594
Re: Impellar Check

Running on muffs will tell you if the impeller is pumping water or not.You really wont know the condition of the impeller.It is a first step too see if it is totally bad or not but I would not depend on it.If the impeller is a few years old you should replace it anyway.It is the type of p.m. that could really save your motor and it is probably the cheapest and easiest. Charlie
 
magster65

magster65

Commander
Joined
Sep 1, 2002
Messages
2,573
Re: Impellar Check

On the 'muffs' the water pressure from your hose will push water through the engine even if the impeller is shot. You'll have to try/do what these fella's said.
 
C

crazy charlie

Vice Admiral
Joined
May 22, 2003
Messages
5,594
Re: Impellar Check

Not the case Magster.Just replaced burnt impeller on my alpha.Did not let a drop of water through on the muffs.Put the new impeller in and all is back to normal 143 degrees. charlie
 
M

medic

Petty Officer 2nd Class
Joined
May 18, 2003
Messages
111
Re: Impellar Check

Thanks guys. How do I do I replace the impellar? Again I don't have a manual yet. Should I post more specs about my setup? What do you need to know?
 
D

denniz

Senior Chief Petty Officer
Joined
Aug 21, 2002
Messages
743
Re: Impellar Check

Is this the same boat I warned you about running in the driveway? Howd the carb turn out?
 
M

medic

Petty Officer 2nd Class
Joined
May 18, 2003
Messages
111
Re: Impellar Check

Yep, this is it. The carb turned out well. Double and triple checked gaskets. Wound up putting o-rings on the idle mix screws. No seepage! Idles great.<br /><br />Got some muffs. Hooked up to water. Let it idle. No overheat. The local boat service center is going to let me take it over tomorrow and drop it in the lake behind their shop. Hope it works when under load without overheating and that the mechanic will give me a hand with adjusting the carb if needed.
 
D

denniz

Senior Chief Petty Officer
Joined
Aug 21, 2002
Messages
743
Re: Impellar Check

Try that before takin on the impellar job. Havent done one in a few years(dont work on strigers"no offence") but they arent fun.good luck
 
M

medic

Petty Officer 2nd Class
Joined
May 18, 2003
Messages
111
Re: Impellar Check

I am new to the boating thing. I have seen OMC "this" and OMC "that". I am looking at a manual on ebay. "seloc omc 1964-1986 sterndrive manual" All I know is that it is an OMC Sterndrive. How do I know if it is a "cobra", stinger", etc...? Will that manual work for me. The seller says it will.
 
S

sea wolf

Lieutenant Junior Grade
Joined
Apr 3, 2002
Messages
1,219
Re: Impellar Check

it's not a cobra. they didn't come out till '86 or '87.
 
M

medic

Petty Officer 2nd Class
Joined
May 18, 2003
Messages
111
Re: Impellar Check

i thought i read that somewhere...thanks
 
M

medic

Petty Officer 2nd Class
Joined
May 18, 2003
Messages
111
Re: Impellar Check

Took it over to the local service dept and they let me drop it in the lake behind their garage. Idles great, did not stall when pulling out or at wide open throttle. It also did not overheat. Just hope it works this weekend when we are in it and ready to have some fun.<br /><br />Thanks to all for your help. I am sure there will be more.<br /><br />Medic
 
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