Need help with aftermarket cross reference (mercury–>lovell marine)

[Silencep77]

Hi all,

New here. Working on a partial restoration of a 1950 Kiekhaefer-Mercury Rocket KE-4. Im looking for piston rings and found a listing on eBay selling ones by lovell marine. He says they are for KE4, MK7 and Merc 110 in the listing, but I don’t know how he knows that.

I believe the original OEM part number was 39-21665 but I am unsure how to tell what the correct Lovell-Marine aftermarket part number is. Just want to ensure proper fitment before I purchase. Does anyone have a cross reference book, or experience with this? Any help is appreciated!

Also, is there a search function for the ask a member forum? I didn’t see one, at least on mobile.

Thank you!

[Waunnaboat]

There is no search function in the ask a member forum, but if you are a member (not sure if “offline” means a member or not), then you can go to the “active member forum” bar when you hover over “members only” on the top of the screen.  There is a search bar there, but not under the plain “ask a member” forum page, which can also be accessed via the members only forum page.  I could not find the piston ring set you speak of, but all of those motors are a similar size to my knowledge, and possibly have the same bore.  Don’t bother replacing the piston rings unless they are bad enough that the motor cannot function.  If you do replace them, this forum may be helpful.  I also linked piston rings from a site that is named “oldmercs”, which I assume is owned or operated by one of the members here, and probably has enough knowledge about these things in addition to the fact that the part numbers match up.

https://www.aomci.org/forums/topic/mercury-ke4-piston-ring/

https://jetes-wgurh.volusion.store/product_p/39-21665.htm

"Outboards seem to multiply exponentially..........I find that for every finished project, there are two more waiting to be completed."

1 user thanked author for this post.

Silencep77

[Silencep77]

Thanks for the help! I had a piston ring break and am looking to replace it. Hard to find. That site you linked is great, but unfortunately they are out of stock. These lovell marines are the closest I’ve come that don’t cost an arm and a leg.  https://www.ebay.com/itm/388852368741

I was going to do a light deglazing with some maroon very fine scotchbrite and put the new ring on. Since this comes with 6, (3 per piston) I figured I’d do all 6, — or at least 3 — so they can seat together. I don’t really want to get into honing, and checking ring gap and if the cylinder is out if round. I don’t think there’s much I could do about that anyway if that was the case.

 

[Tubs]

Otto gas engine works. Order rings by size.   https://www.enginads.com/otto/

A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.

1 user thanked author for this post.

Silencep77

[Author]

Posts