Oil cap breaks..what are the repurcussions?

mcbass

Cadet
Joined
Jul 28, 2004
Messages
27
Hi there...used the board a couple of times for research...never for an issue..until now..<br /><br />I have a 2000 Mercury 150 EFI 2~.<br />Put it in the water last night and ran it wide-open for about 2 minutes to a fishing spot, then shut it off.<br />I noticed an oil slick behind me. <br />I started the motor and noticed that it was quite smokey.<br />Popped off the cowlin and saw that there was oil all over the engine, and quite a pool had collected below. <br />The first thing I did was to remove the oil cap on the engine resevoir. It was just a hair loose. When I tightened it, it broke. The threaded neck totally seperated from the top where the float passes through it.<br />Couple of questions:<br />1. The most important thing on my mind (as I sit here at work without access to the boat) is-was all that smoke due to my motor burning up due to lack of oil? There was AT LEAST a tank's (small top tank) worth of oil on the motor and inside the cowlin-and the upper resevoir was not empty..so I'm assuming that oil was stll travelling from the tank in the hull to the tank on the motor and then leaking out of the cap...but was enough getting to the motor? Is it possible that the leaking oil was able to make it's way down and burn/smoke when coming into contact with the exhaust? I DID notice that oil was leaking from the "sleeve" that seems to surround the upper part of the lower unit (it is between the bottom of the cowlin and the lower unit)*sorry for my lack of terminology*. I didn't notice anything amiss when I last ran it and put it away, but it was to the same spot..so I assume it has run 2-10 minutes at full-throttle with this issue. The motor still seemed to run great...if you discount the slick and the smoke..so I'm hoping my only issue will be the replacement of the cap and cleaning up the motor and cowlin. Which leads me to my other question:<br />2. Is there any way I could check the motor out to see if I've damaged it due to running with no oil or should I have it checked by someone who knows what the heck they are doing after replacing the resevoir cap?<br />AND<br />3. Is the cap/float/connector all one part or do I have to buy a whole new tank/cap/etc?<br />Thanks very much for your assistance in advance!<br />Regards,<br />mcbass<br />www.mcbass.com
 

WillyBWright

Fleet Admiral
Joined
Dec 29, 2003
Messages
8,200
Re: Oil cap breaks..what are the repurcussions?

Welcome to iboats.<br /><br />Replace the cap and don't worry. The motor only uses pressure to get the oil from the big tank to the little tank. From there, the pump draws oil from the bottom of the small tank. You can get just the cap assembly.
 

mcbass

Cadet
Joined
Jul 28, 2004
Messages
27
Re: Oil cap breaks..what are the repurcussions?

Thanks!<br />What do you think caused all of the smoke?<br />Got any hints on how to de-oil my engine?<br />mcbass
 

AndyL

Petty Officer 1st Class
Joined
Jul 1, 2002
Messages
307
Re: Oil cap breaks..what are the repurcussions?

If it makes you feel any better the same thing happened to me. Saw oil in the water , removed cowling ,saw it had run out of top oil tank and did the same as you. Attempted to tighten it and sheared the top of the cap off. You could clean it off with a solvent oil ie WD40 and a lot of tissues. Place tissues in the lower cowl and blast down the oil to it. Otherwise you will have to remove the airbox etc and it all becomes very fiddly.As long as the header tank didn't empty (alarmed anyway) you should not have done any dameage to the motor.
 

gss036

Commander
Joined
Jan 18, 2003
Messages
2,914
Re: Oil cap breaks..what are the repurcussions?

The problem with broken caps are common. I am on my 3rd one now, so the only hurt is the $50 for a new one and 15-20 minutes to replace it. Just buy the cap assy, the float, etc., is all one unit. Just follow the wires and disconnect them. Most are wound in pretty akward but they need to be tucked away.
 

mcbass

Cadet
Joined
Jul 28, 2004
Messages
27
Re: Oil cap breaks..what are the repurcussions?

Thanks for everyone's help!
 
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