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02-18-2019, 04:16 PM #15000 RPM
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Correct center mains for Merc 2.5
Using a different crank which has no retainers shoulders for the center mains going into a 1998 Merc 2.5L block. I know I need center mains with the retainer lip. I need the correct part number to order them.. I lost that info. I retired from rebuilding these things.. But I know to use the right bearings.. Pro Marine number is OK or the OE number or X-ref.. Thanks in advance for input..
20ft Gambler with Merc 260
Too many projects to liist..
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02-18-2019, 04:30 PM #2Supporting Vendor
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Pro Marine number for the 260-280-300 Drags middle main bearings I build is :
167
OEM # is 31-16756A6
Good luck !
Jay
Jay @ JSRE
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02-18-2019, 05:37 PM #3Screaming And Flying!
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NO NO NO...2.4 cranks.... NO
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nitro_rat liked this post
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02-18-2019, 06:35 PM #4Supporting Vendor
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Dunno , 2.4’s ain’t my bag , I’m saying what middle mains I use in ALL 2.5 engines ...
JayJay @ JSRE
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02-18-2019, 07:24 PM #5
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02-19-2019, 09:05 AM #6
you cannot/should not use a NON-SHOULDERED crank in a 2.5 style block period.........…
tha only "early crank" that will work come fron tha 2.0 production and Hi Perf. 2.4.... they are shouldered to accept tha plastic case bearing.....Last edited by tlwjkw; 02-19-2019 at 09:08 AM.
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02-19-2019, 09:54 AM #7Screaming And Flying!
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yes
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02-19-2019, 11:47 AM #8
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02-19-2019, 12:01 PM #9
tha "crank, center bearing issue" has been discussed many, many times on here..... some folks say they run tha non-shouldered crank with tha big OD plastic with no problems.. so they say?.. never had such thing happen with tha ones I actually saw for my self......
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02-19-2019, 04:10 PM #10Screaming And Flying!
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I would think.....that when the rollers find that part of crank that is larger than the right size.... the bearings be not happy.... better to use the right part. A early 2.0 crank will work
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02-21-2019, 10:31 AM #115000 RPM
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Any chance someone can post pictures of the "shouldered" vs "non shouldered" cranks?
Mike Nass
Haulin Nass RaceBoats (HNR)
www.haulinnassraceboats.com
e-mail - MikeNass@shaw.ca
phone - 604-230-4835
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02-21-2019, 10:58 AM #12counter weight will be smooth on tha face on non-shouldered where tha one below you can see tha shouldered center mains.... best I can do for ya since photo bucket went south!
https://www.ebay.com/itm/7236A2-8745...TtAx:rk:1:pf:0
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02-21-2019, 11:03 AM #13Supporting Vendor
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Mike,I can't do the pics,but the shoulder in question is built and machined on the counter weight where the center main journals meet the counter weights.This shoulder,or flange,is there to support the upper and lower edges of the plastic needle carrier,that runs in an open-ended outer race.The 2.4 crank has no flange,only a radiused joint.This crank ran a bearing that had a flange on the center main races,that held the needles captive.There is no similar bearing available to fit the larger 2.5 main ways,so only the flanged crank can be used,or the plastic needle carrier will wear away on the unfinished counterweight surface.Hope this clarifies,Chris
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02-21-2019, 06:02 PM #14Screaming And Flying!
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The real early 2.0 cranks can work... just use 2.5 bearings and top from early 2.0..... Put ya 2.4 cranks in 2.4s and early 2.0s.....
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