torque specs

[sean1982]

hi, could someone give me the correct torque specs for the heads and the exhaust divider plate on a 99 2.5 200 carb motor, as i have done a search and it has come up with a few different torque specs.
cheers

[h2oskiier30]

Per the Merc service manual:

Heads...Apply light oil to threads and bolt face and torque to 30ft/lbs, then turn an additional 90 degrees (I generally just torque to 38-40 lbs in three progressive steps)
Exhaust divider...Apply 271 Loctite to threads and torque to 200 in/lbs

[Dave Strong]

Per the Merc service manual:

Heads...Apply light oil to threads and bolt face and torque to 30ft/lbs, then turn an additional 90 degrees (I generally just torque to 38-40 lbs in three progressive steps)
Exhaust divider...Apply 271 Loctite to threads and torque to 200 in/lbs

X2 on the 40lb/ft for the head bolts, never been a fan of the +90deg thing.

Dave

[perfmarine1]

You forgot to mention replace bolts if you do the 90degree thing,

[sean1982]

how does the exhaust divider plate work out in ft/lbs?

[Dave Strong]

200 divided by 12 = 16.7lb/ft.


Dave

[Jay Smith]

I use 36 ft lbs on the head bolts ( BUT ) I do install head bolt washers on most every engine I build . I also opt for the top two bolts to be 1/4" longer ( Mercury part number 823118 ) and torque those 5 lbs more.... I apply grease to the threads and light oil to the bolt flange and washer to achieve an accurate torque value.. I too don't use the 30LB 90 * BS...

Torque the Divider plate at 18 FT lbs with 271 loctite applied..

Both torqued in an X pattern making the X pattern larger going from side to side until all are torqued..

Good luck,
Jay

[Dave Strong]

Grease on the threads and oil on the washers? I've always done the oposite, but what do I know.


Dave

[rev.ronnie]

ARP Ultra Moly will gives very consistent torquing. Both on threads and friction faces. The stuff is very repeatable. I use on rod bolts and the stretch gauge really confirms it. Great results on main and head studs too.