Hi all. Decided to have a go at servicing my Enya 90-4c today as it had been left a while unprotected. I've not taken a 4-stroke apart before so my question is, how do I remove the timer housing? I have removed the four screws but when I look inside from the front I cant see what is stopping the housing from coming away. Thanks in advance.

Any advice please ??

Have you removed the valve rockers and pushrods yet? If not, there is still tension on the lifters from the valve springs. If the engine has been sitting for some time, you could have dried oil on the cams which would prevent them from easily slipping off the lobe and make removal seem difficult. Also, you state you have removed the four front housing bolts. Have you not yet removed the four bolts on the rear of the cam housing that attach it to the rear of the engine?

John

Hi JWN, thanks for your reply. Yes, I have removed all the screws from the rear housing. the push rods and rocker arms are off. The only thing is that the rod lifters seem to be stuck in place. Do you think it could be these stopping the rear housing from coming off? Should I apply heat to the rear housing?

I cannot think of a way stuck lifters would prevent the cam housing from coming free as they only contact the housing and the cams. The cams are contained within the housing so that shouldn't be a problem. The housing only butts up to the back of the crank case. Does the housing move at all or is it just stuck to the back of the case? If it moves, it "should" fall right off. If it is stuck, try giving it a gentle tap with a small hammer through a block of wood or use a small mallet. It sounds like the gasket between the housing and the case is doing it's job really well!

John

The top half moves away from the housing a little but the bottom end seems to be held in place by something tougher than the gasket. It's as if there is a hidden screw holding it in place. I know there is not but that's what it feels like. I don't want to start bashing it as I don't really know what I'm doing. I thought this was going to be easy !!