Mercruiser 4.3LX Roller Lifter

[adam619]

I am rebuilding a 1993 mercruiser Gen II 4.3LX (GM 262) 4BBLwith balance shaft and I cannot find difference between hydraulic lifters part number for different years. If I look at my serial number 0F118521 the merc part # is 811844 T. As I am looking for aftermarket replacement I can only find Melling PN JB 2079 as a replacement however this only replaces the 811844-1 merc p/n which is on the Gen+. My question is does anyone know the difference between both if there is one. The retainer is identical on both and camshaft as well.

Thanks for your advice in advance

Adam

 

[Scott Danforth]

This may help...https://forums.iboats.com/forum/eng...history-of-the-4-3-liter-with-casting-numbers

Your dealing with a 92-95 GM 4.3 .Melling or sealed power lifters are about $8 each

 

[adam619]

Thanks for the info lots of good details to have but I still cannot cross reference merc p/n 811844 T to a sealed power or melling p/n, the only one I find a match for is the 4.3LX Gen+ which has a 811844-1 merc p/n to a melling JB 2079,

would the gen2 and gen+ 262 chev use the same lifter , why is there a different merc part number but when looking at chevy s10 all lifter are the same 87 to 95.

Thanks

Adam

 

[Scott Danforth]

its not a merc part. its a GM part. Merc bought the long-block from GM and added their exhaust and accessories to it. Merc wont give out cross-reference because they want the parts business.

everything between the valve covers and the oil pan are stock GM components from the Tonawanda engine plant

you are looking for a GM roller lifter for a 1992-1995 4.3 (non-vortec balance shaft motor). exact same ones in 1992-1995 S-10's, however the lifter retainer was changed with the addition of the balance shaft in 1992 not sure if the lifter itself changed at that time frame.

mercrusier got ahead of itself with gen1, gen2 and gen+ names.

the reason is that GM used roller cams from early on in the automotive market and the industrial engines (including marine) got the roller cams later when the vortec heads came out. Just like the SBC for 1988 was first year for roller cams in cars, trucks came in 89, however the boats didnt come until 1996. however to boost hp, the 1992-1995 marine 4.3 also got the roller cams that the truck motors got.

 

[gergAlicious]

Yep - I got push rods for the 4.3 at AutoClone for $3 each . . . .

 

[adam619]

Thanks a lot for the replies, I appreciate your time

Adam

 

[porscheguy]

Buy lifters locally so you can check the roller on each one at the counter. I bought some sealed power lifters last year and on a whim with no prior knowledge I decided to pull a few out of the boxes and roll the roller. Of 16 lifters, I found 2 or 3 that had rollers that were tight and slightly crunchy when moved. I don’t know if this is an issue, or me being cautious. But I insisted they take the “bad” ones back and get me some more. I was replacing them on a LS series 5.3 which requires head removal to change lifters. And since the collapsed lifter had a stiff and crunchy roller, I was taking no chances.

 

[Lou C]

Interesting,thought the GM marine engines got the roller cams earlier because my ‘88 4.3 has a roller cam..

 

[Scott Danforth]

Interesting,thought the GM marine engines got the roller cams earlier because my ‘88 4.3 has a roller cam..

could have been an error or exception. however I know it was standard for the 92 on 4.3 V6 and it was standard on the marine SBCs in 96 (even though the block had the casting features for use of roller cams since 1988)

 

[porscheguy]

GM stArted phasing in roller cams in cars in ‘87. By ‘88 all of their V8 cars had rollers. In ‘87 all 4.3s had rollers regardless of the application. Pickups with small blocks didn’t get rollers until ‘96.