Stuck upper engine flush cap on 2004 Suzuki D250

[Junenmik2]

I have a study valve cap on my 2004 Suzuki D250. I have tried penetrating oil but it won't budge and I don't want to destroy yYThe cap. I am on a lift and given the extended engine mount u can't place the muff with out falling in the water.any suggestions to correct this? Thank you

[Harper]

If it's truly stuck so firmly that you're concerned about breaking something, maybe you should buy a new replacement for it, then go ahead and take the pliers to it. If it is the same as the DF150/175 (I'm pretty sure it would be), it's just a plastic piece and seals with an o-ring, rather than by the tightness of the treaded fitting (the receptacle is a female hose thread) and it's doubtful that you could do any damage to the threads in the motor. I have a feeling that if you use a pair of pliers, that it will let go before it breaks. The o-ring is just "glued" to the receptacle.

[Moonlighter]

I agree with Mike.

When you put it back in, a little bit of grease on the O ring is a good idea to help it stop sticking again.