1974 40hp merc 402 lower unit removal

[merc1974]

I'm looking for a video or step by step instruction on removing lower unit to replace water pump parts can't find instruction in book serial # 7038943.

 

[racerone]

Re: 1974 40hp merc 402 lower unit removal

Remove the bolts / nuts including the hidden one under the trim tab.----The lower unit should come off.----Shift is splined , no disconnect.----------If driveshaft / crankshaft splines are jammed with rust it can be a challenge.

 

[merc1974]

Re: 1974 40hp merc 402 lower unit removal

Remove the bolts / nuts including the hidden one under the trim tab.----The lower unit should come off.----Shift is splined , no disconnect.----------If driveshaft / crankshaft splines are jammed with rust it can be a challenge.

Thanks so 3 bolts total and what torque for the bolts

 

[racerone]

Re: 1974 40hp merc 402 lower unit removal

As stated there may be a hidden bolt under the trim tab !----------No torque value needed really.

 

[merc1974]

Re: 1974 40hp merc 402 lower unit removal

Thankyou

 

[carholme]

Re: 1974 40hp merc 402 lower unit removal

Here is a link to the condensed version of the Clymer manual. Download it soonest to your computer as the link is short lived.

MERCURY - TWO-CYLINDER MODELS.: Small Engine Repair Reference Center Home

This will show the LU removal as well as the thermostat question from your other post.

Gerry

 

[merc1974]

Re: 1974 40hp merc 402 lower unit removal

awesome thanks Gerry