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88 merc inline rod bolt torque

R

rhett mathisen

New member
in the process of rebuilding my 88 Merc 115, i have the rotating assembly built and wondered what the rod bolt torque may be. I have new rod bolts and also wondered if i should use a dab of blue/red loctite? coming together nicely, 6 new .020 over 2 ring Wiseco pistons, completely balanced rotating assembly, turns through very nicely!! i have the factory book for my 70 1350 but im sure the spec is different because it uses nuts instead of bolts. or i may be wrong...lol thnx in advance!!
 
Hi Rhett,

I found a factory Merc manual that covers all 75-150 4 and 6 cylinder inline Mercury engines with S/N 4112635 and up. 90-86134-4 is the part number for the manual.

In the powerhead torque specifications, it states 180 inch pounds (20.3 newton meters) of torque for the rod bolts. In the illustration, it shows both the bolt-style cap and the nut-style cap. Both have the same torque spec according to this book. The manual states to install NEW, CLEAN, DRY connecting rod fasteners. It must be important since it was in ALL CAPS!

You may want to double check the numbers with your book. I'm not an inline expert at all! Hope this helps.

Jeff
 
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