[soups7]

Does anyone have information about 2010, 2011 & 2012 touring model heads that develop spiderweb cracks? Heard about this from Dave Mackie's shop. They won't perform any mods to them because they may fail.

 

[Fnhracer]

I tlked to Frank at Dragos today about doing my heads and he told me 08 and up are prone to cracking. 3 out of 10 he said. Im sending mine out tomorrow and im worried about this

 

[Hillsidecycle.com]

The fracturing of the Mercury-Marine casting can occur in/around the guide bosses at the point of guide installation.
We use Extreme Pressure Lubricant # 3 on the AV&V guide on our Stage II, III, and IV Heads, and do not seem to have issues.
Scott

 

[Desertwndrr]

As I understand it it is only castings from a specific manufacturer. When I sent my heads in to Baisley he would only work on castings with a specific manufacturer marking. I got lucky and had the right ones. Mines a 2012. Just pulled my heads off after 18,000 miles. No issues.

 

[soups7]

Thanks for the feedback. Looks like my heads came from the defective batch.

 

[dynoguymn]

The merc 332m castings are the culprits.


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[Hillsidecycle.com]

Mercury-Marine has been manufacturing many aluminum castings for the Moco for some time now, to include the crankcases.
For the most part, they are pretty darn good.
Scott