587cc Crankcase (top)

[SurfBeat]

While cleaning the old gasket off the top crankcase to mount the jugs (cylinder block) I noticed several pits. It appears when I had this Doo engine completely rebuilt in 2005, the repairman simply put the gasket in place, covering the pits because there were no pits in the gasket.

The pits are in the area where the jugs attach to the crankcase. There are two portholes beginning at the top of the jugs, between the cylinder head and the manifold.

The area I refer to has a lot of black residue that was emitted from the portholes, a very clean cut diagram replicating the portholes, about 3" long.

My question is do I have a problem, or do I merely put the new gasket on the crankcase and secure the jugs to the crankcase?

The pits are only on the inside of the rim of the crankcase, where the portholes from the cllinder block mate with the crankcase.

 

[seadoosnipe]

Pix....

You'd need to take a pix so I can better understand what you are referring to. I have looked over the parts and really can't see what you are describing, unless it's something that is not suppose to be there.

The cylinders have a fitting at the bottom of the water jacket so when you pull the ski from the water, the water drains from your cylinders.

If you are talking about the mating surface of your cylinders to your blocks, you might have this are bonded, as long as it's not suppose to be there.

As long as the first few MM's from the inside out are solid and can attain a seal between the casing and cylinder, I don't see where you should have much of a problem......

 

[SurfBeat]

Snipe:

I attached the photos you requested. Hopefully I get the all clear from you, i.e., I need not worry about the pits in the photos.

Also, thanks for the info on whre to place the grease on the oil seal. To make clear, the part of the seal facing away from the seal is smooth, the part facing the bearings is concave, so I had filled that cavity with synthetic grease as related by Clymer's, but after reading your reply I'm cleaning otu the cavity and re-filling with lithium.

Hell, I had plenty of that in the garage, but went to auto zone to purchase synthetic and on the way home my fuel pump in my Olds Bravada went out. There went the afternoon replacing that. I will be a mechanic soon if this crap keeps up.

 

[Dr Honda]

You are fine. just make sure the new base gaskets seal.


What that is from... is that the original gaskets had a hole in them, and the cooling water etched the case top. FYI... the yellow engine had cooling from the jugs down into the back of the case. They closed it off with the white engine.

 

[SurfBeat]

Dr H:

Based upon your answer is the reason I am now learning how to work on my own SD's. (that statement is not an attack on any of the knowledgeable mechanics on this site that take the time to help us non-mechanics)

I know many of my questions I post on the Forum may appear pedant, however, I want to take the extra time to ensure I do the job right and in a situation where someone I run into at the River needs help, the help I dispense is "helpful."

In my case, in response to Dr. H's reply to my post, I paid about $1100 in 2005 to have my engine rebuilt and what did I get: a defective crankshaft that I was told must have been obvious to the mechanic that rebuilt my engine; inferior gaskets.