jfbrink Posted June 6, 2014 Report Share Posted June 6, 2014 Hey, gang, I've known for some time that my motor mounts on my '66 411 were sagging. They are such an odd design, with that 100% shear load. I knew about this place Mighty Mounts, in Rosemead, CA, that refurbishes mounts, so I decided to give it a try. Bad Idea. He only has one hardness of rubber, and it is apparently way harder than the stock mounts, because my car went from having a still and rattle-free interior to being a horrible, vibrating, noisy mess. It's so bad, I don't even want to drive the car. Given the weird design of the stock mounts, I can't begin to think of how I would fabricate new ones, even if I were able to find some soft rubber mount to build around. And, I'm not ready to engine-swap this car. So... anyone have a pair of stock J13 mounts in decent shape? Jesse. Quote Link to comment
Lunatik Posted June 7, 2014 Report Share Posted June 7, 2014 I was planning in doing mine, I found this topic in the NICCO website http://www.nicoclub.com/archives/make-your-own-motor-mounts-heres-how.html Quote Link to comment
MikeRL411 Posted June 7, 2014 Report Share Posted June 7, 2014 As a last resort, drill "honeycomb" holes parallel to the engine block. The too hard rubber will act like a foam matress, but not so soft. Quote Link to comment
jfbrink Posted June 7, 2014 Author Report Share Posted June 7, 2014 On these J13 mounts, unfortunately, the rubber is completely enclosed by the U-shaped steel bracket that mounts to the block, so I can't drill them. Likewise, the weird construction of the mount prevents a home-pour solution (which I've done with success on other cars with simple "pillow" mounts). At the moment, I'm coming at it from the other direction, and seeing if I can get the engine to simply run more smoothly. I found today, to my surprise, that my timing was pretty far off, and adjusting that helped out above 1200RPM. But, it's still super-shaky from 600-1200RPM. I don't know if I'm going to be able to smooth that out with a carb rebuild (which is long overdue), as it may just be the Datsun shimmy. Best, Jesse. Quote Link to comment
ggzilla Posted June 7, 2014 Report Share Posted June 7, 2014 J13 engine normally idles very smoothly. Sounds like you have a problem that is not caused by motor mounts. Quote Link to comment
Swedishcadillac Posted June 15, 2014 Report Share Posted June 15, 2014 http://www.ebay.com/itm/DATSUN-410-411-FRONT-NEW-MOTOR-MOUNTS-PAIR-NISSAN-/181439355787?pt=Vintage_Car_Truck_Parts_Accessories&hash=item2a3ea0db8b&vxp=mtr I reckon these come up on eBay every 10 years when Friday the 13th aligns with the full moon... Quote Link to comment
Datsun Dude Posted June 16, 2014 Report Share Posted June 16, 2014 http://www.ebay.com/itm/DATSUN-410-411-FRONT-NEW-MOTOR-MOUNTS-PAIR-NISSAN-/181439355787?pt=Vintage_Car_Truck_Parts_Accessories&hash=item2a3ea0db8b&vxp=mtr I reckon these come up on eBay every 10 years when Friday the 13th aligns with the full moon... Nice. I'm actually looking for those as well. Unobtainium!! Quote Link to comment
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