mercruiser 888 overheating...air bubbles in water inlet hose from outdrive

[Boatch]

Re: mercruiser 888 overheating...air bubbles in water inlet hose from outdrive

not sure of number for base but it came from sierra kit #18-3317....yes on the gaskets,i double checked those...

 

[Boatch]

Re: mercruiser 888 overheating...air bubbles in water inlet hose from outdrive



Here are some pics of the hole I was telling you about..

 

[achris]

Re: mercruiser 888 overheating...air bubbles in water inlet hose from outdrive

I think that hole is a drain. It doesn't go into the water cavity in the base itself but all the way through to the centre, yes? I looked up that Sierra number and it appears to be the right part.

What exactly is the water leaking from when you pressure test it?

Chris.......

 

[haulnazz15]

Re: mercruiser 888 overheating...air bubbles in water inlet hose from outdrive

The hole you have pictured is not the threaded hole for the flush attachment, so you likely have the correct water pump base. I assume you were using the o-ring that goes in the groove at the bottom of the base, correct?

 

[Boatch]

Re: mercruiser 888 overheating...air bubbles in water inlet hose from outdrive

thanks guys..yes on o-ring gasket at base...when I put the lower unit on muffs it seems like water is weeping from that hole,and fills up area where the shift shaft is...

 

[Boatch]

Re: mercruiser 888 overheating...air bubbles in water inlet hose from outdrive

yes it does go all the way through to the center too....

 

[achris]

Re: mercruiser 888 overheating...air bubbles in water inlet hose from outdrive

thanks guys..yes on o-ring gasket at base...when I put the lower unit on muffs it seems like water is weeping from that hole,and fills up area where the shift shaft is...

A small amount of water passing is normal....

Did you pressure test from the front of the drive with the water tube plugged? (pressure test for the water pocket cover)

Chris..........

 

[Boatch]

Re: mercruiser 888 overheating...air bubbles in water inlet hose from outdrive

ok! I think I might have the wrong base...you are correct mine is a MC-1 with the preload pin...if you go to tungstenmarine.com you can see that the water inlet is on the other side than the one I have..check it out and tell me what you think? Im talking about the base fyi...sorry little excited...its been a battle....lol

 

[Bt Doctur]

Re: mercruiser 888 overheating...air bubbles in water inlet hose from outdrive

post a pic of your base.this is the base gasket for the mc1.

Sterndrive Exploded Views : MerCstuff.Com

 

[Boatch]

Re: mercruiser 888 overheating...air bubbles in water inlet hose from outdrive



that is the gasket I have...but as you can see the water inlet hole is on the right side...the MC-1 base has the hole on the left side...????

 

[Bt Doctur]

Re: mercruiser 888 overheating...air bubbles in water inlet hose from outdrive

http://www.boatfix.com/merc/Servmanl/6/6C3R3.PDF Go thru this and you will understand it better.

 

[Bt Doctur]

Re: mercruiser 888 overheating...air bubbles in water inlet hose from outdrive

This is your kit

http://www.iboats.com/mall/partfind...&gd_poid=110922&gd_row=2&session_id=368726566
And how they go together

 

[Boatch]

Re: mercruiser 888 overheating...air bubbles in water inlet hose from outdrive

https://www.facebook.com/photo.php?v=3273678056809&l=1312268548905811963

 

[Boatch]

Re: mercruiser 888 overheating...air bubbles in water inlet hose from outdrive

ok....I posted a video of air in water inlet line...I have new water pump and base,replaced waterpocket gasket,please help with any suggestions...check out video..thanks guys...

 

[hivoltg]

Re: mercruiser 888 overheating...air bubbles in water inlet hose from outdrive

Are you sure you have the slinger on the shaft over the impeller top housing?

Part: GLM 21330 or Merc 25-30271

 

[Boatch]

Re: mercruiser 888 overheating...air bubbles in water inlet hose from outdrive

yes I do ...I also made sure it was down snug on the housing....this has been a long battle bro,and im totally stumped at this point....im pretty sure its exhaust bubbles cause it only does it when I rev the motor????

 

[hivoltg]

Re: mercruiser 888 overheating...air bubbles in water inlet hose from outdrive

I would test the water pocket cover then, as stated before its no fun to fix.

I have the same drive setup as you but a 351 transplant. I just changed my impeller and housings this evening. I hope you find the problem.

 

[Bt Doctur]

Re: mercruiser 888 overheating...air bubbles in water inlet hose from outdrive

did you retest the lower unit when you replaced the base and gasket with the muffs?

 

[Boatch]

Re: mercruiser 888 overheating...air bubbles in water inlet hose from outdrive

I did bro...and it looked good....so it seems that either its my water pump,or water pocket cover???is the anything else that it could possibly be?and thanks guys for help....

 

[hivoltg]

Re: mercruiser 888 overheating...air bubbles in water inlet hose from outdrive

This video shows a motor with a similiar issue. They claim it was fixed with a new base plate. The bolts where over torqued when it was replaced by their local marina and it was warped. I would try some silicone below it before I spent more money chasing the problem.

The only other thing I would check besides the stuff mentioned would be your water line to the motor may be cracked and sucking air.