Head bolt torque - 4hp 2 stroke

[chris-s]

I have an early 2000 Mariner 4hp 2 stroke that is being a pita, it was suggested I take the head off to check out the cylinder etc, which turned out to be perfect, incredibly clean actually, but then I realised I didn’t know the torque settings for the head bolts and am finding it incredibly hard to google it. I’ve failed to find the info for engines that might be similar.

Anybody able to help before I just use the German gudentite standard?

Chris

 

[James_Calvert]

In the absence of any proper advice...if the cylinder block is alloy, don't overtighten.

 

[rogerthebodger]

Will this thread help

Mariner 4 service manual or service info needed

 

[chris-s]

Will this thread help

Mariner 4 service manual or service info needed

I found that page earlier, none of the links work anymore.

I think 9nm should be about ok if nothing else comes to light.

Chris

 

[neil_s]

For the Tohatsu 2.5 and 3.5 it's 0.9 - 1.1 Kg m

 

[VicS]

I have an early 2000 Mariner 4hp 2 stroke that is being a pita, it was suggested I take the head off to check out the cylinder etc, which turned out to be perfect, incredibly clean actually, but then I realised I didn’t know the torque settings for the head bolts and am finding it incredibly hard to google it. I’ve failed to find the info for engines that might be similar.

Anybody able to help before I just use the German gudentite standard?

Chris

Ask on the Mercury/ Mariner board of the iBoats forums and/or the MarineEngine forums

Mercury & Mariner Outboards

https://www.marineengine.com/boat-forum/forums/mercury-mariner-outboard-forum.30/

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