Clamshell crank cover liquid gasket

9D280 · 26 July 2010, 11:59

Well, the reassembly has halted temporarily as I have discovered a three way puzzle!

My Clamshell is covered by 2 editions of a Marner Clymer (one bought for my old Yam, the '75-'81 copy, the other bought for the Merc I thought I had bought before discovering the engine was older than the livery on the case implied - the '82-90 copy).

So, the two clymers disagree as to where the liquid gasket goes, and to confound maters further, neither match where I cleaned the old liquid gasket off the sealing surfaces on dissassembly!

So, any of you Merc genii know where this squezy gasket actually goes, and the quantities I need? I have everything frrm a continuous 1/8" bead taking a meandering tour round the entire joint to a "small amount" at the point where the cork seal meets the bearing carriers.

uncle al · 26 July 2010, 16:47

if you want to ring me with a fax number i will fax the diagram of the bead of loctite 514 quoting from the factory service manual pn 90-861355 chapter4A-24
a continuous bead 1/16" or 1.6mm thick behind the crankcase bolt holes (that is between the bolt holes and the inside of the crankcase)
i hope this helps
regards
uncle al
phone 01869 326411

T 15 · 26 July 2010, 17:07

as in attached

9D280 · 26 July 2010, 17:31

Cheers guys,

Al,
That certainly agrees with the '75-81 Clymer, however It's certainly not what I cleaned the remains of off when I took it to bits. What you describe sounds pretty much where the cork seal strip runs. '82-90 Clymer implies a reasonable blob around the ends of the cork, but the way the diagram is drawn, it implies it's asymetric! (i.e inside on the R and outside on the L....)

T 15,

I have the 3 cyl lump, but thanks anyway, help always appreciated.

uncle al · 26 July 2010, 19:10

go with the picture from T15 same as my manual good luck

9D280 · 27 July 2010, 08:33

?????? but that's the 4 cyl! I have a 3-pot with a cork sealing gasket strip in a groove.......

uncle al · 27 July 2010, 09:02

it is the same as a three cylinder

T 15 · 27 July 2010, 09:15

Quote:

Originally Posted by 9D280

?????? but that's the 4 cyl! I have a 3-pot with a cork sealing gasket strip in a groove.......

the manual covers 45 & 50 4cyl and 50,60 & 70 3cyl, so I would assume a "standard" photo/diagram in a section will apply to all models, ( I would go with uncle al )

( my manual is the same as uncle al, Mariner/Mercury 90-86135-5 )

9D280 · 27 July 2010, 09:20

but mine has a groove in the cover that takes a cork seal strip,that runs outside the bolts.

When I disassembled, there was no sealant debris inboard of the bolts, and if I ran a bead as described (or a variation of it) there is a high chance I'd block the CCV holes.

As I have never managed to get a link to the Ishop microfices to work (to bung a pic up) , I have a cylinder block similar to that found on the microfiche for serial numbers 9469200 THRU 9683054

T 15 · 27 July 2010, 13:14

Quote:

Originally Posted by 9D280

but mine has a groove in the cover that takes a cork seal strip,that runs outside the bolts.

When I disassembled, there was no sealant debris inboard of the bolts, and if I ran a bead as described (or a variation of it) there is a high chance I'd block the CCV holes.

As I have never managed to get a link to the Ishop microfices to work (to bung a pic up) , I have a cylinder block similar to that found on the microfiche for serial numbers 9469200 THRU 9683054

what is your Serial No ?

what year is ur engine ?

another manual, Clymer > 1989, that I have, shows it as "our" post before & as the page I posted BUT in an older Merc Manual > 1978, it shows as you explain: with a strip gasket inset into the cast which is then coated with Permatex 2c-12 sealer, will post pic soon.

T 15 · 27 July 2010, 13:38

Quote:

Originally Posted by T 15

what is your Serial No ?

what year is ur engine ?

another manual, Clymer > 1989, that I have, shows it as "our" post before & as the page I posted BUT in an older Merc Manual > 1978, it shows as you explain: with a strip gasket inset into the cast which is then coated with Permatex 2c-12 sealer, will post pic soon.

see

for above

BUT after having a closer look thro manual 90-861455, it has a section ( 4B ) on 3cyl powerheads & on pager 4B-23 it shows a strip gasket & sealer only to side a, none to side b/sections b & sparingly near bleed holes c

see below

9D280 · 27 July 2010, 14:18

Quote:

Originally Posted by T 15

what is your Serial No ?

what year is ur engine ?

I could guess an average serial number for the bits it's been assembled from!

Quote:

Originally Posted by T 15

another manual, Clymer > 1989, that I have, shows it as "our" post before & as the page I posted BUT in an older Merc Manual > 1978, it shows as you explain: with a strip gasket inset into the cast which is then coated with Permatex 2c-12 sealer,

Yeah, it was the pic in the later Clymer that was puzzling me, although your Pic 2 confirms my Clymer hasn't dropped a clanger - namely asymmetric sealant! It was mainly the fact it appeared to show it being applied on one side but not the other that raised my suspicions, especially as neither of my Clymers appeared to match what I cleaned off the joint. Your description mirrors exacly what I removed, so query solved! (This also may help to date my powerhead for future spares ordering!)

Many thanks for your help, the rebuild now can start in earnest.