New Bosch Battery: Much Better than Interstate
04-27-2016, 11:57 AM
#46
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taping that hole will not work. there is really nothing to tap. I tried this and the one thread or so I got on there stripped immediately.
That said, this is very simple.
Find a bolt that fits snugly through the hole in the hold down bracket, drill the hole in the tray to match, and then put a nut under the tray and hold it in place with a wrench as your tighten down. You'll want a bolt approximately 25mm long.
Alternatively, you could take the tray off and either weld or epoxy a nut onto the tray.
That said, this is very simple.
Find a bolt that fits snugly through the hole in the hold down bracket, drill the hole in the tray to match, and then put a nut under the tray and hold it in place with a wrench as your tighten down. You'll want a bolt approximately 25mm long.
Alternatively, you could take the tray off and either weld or epoxy a nut onto the tray.
I called a local independent Porsche specialty shop to see how they install H-8 batteries in 996's and Boxsters. They said they just hold a nut using their finger underneath the battery tray on the non-threaded hole and tighten. But they did say they could weld a nut for me for $20, which seems like the best way to go.
04-27-2016, 12:35 PM
#49
Race Director
Just like a an expanding wall fastener - you drill a slightly larger hole, insert the jack nut, and tighten the bolt. As the bolt tightens, the ribs collapse and increase the diameter of the body of the jack nut enough that it locks the nut in place. The divots around the perimeter of the jack nut are there so you can grip the nut to keep it from spinning during initial tightening.
You've probably used one of these to hang up a curtain rod or something...same principle.
You've probably used one of these to hang up a curtain rod or something...same principle.
04-27-2016, 12:38 PM
#50
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Like a drywall expansion bolt - you drill a slightly larger hole, insert the jack nut, and tighten a bolt. When you insert and tighten the bolt, it causes the ribs to collapse outward, increasing the diameter of the body of the jack nut enough that it locks the nut in place.
04-28-2016, 01:40 AM
#51
Instructor
Thread Starter
Below are photos of the left and right sides of my battery. The hole on the left is open. When I bought the battery, it had a drop of sulfuric acid in the hole (sulfuric acid looks different than water, having a higher index of refraction, and doesn't evaporate very fast). Now you can see sulfate-looking residue. The right side came with a plug.
04-28-2016, 12:49 PM
#55
Rennlist Member
The instructions said that this AGM battery is sealed, but:
Below are photos of the left and right sides of my battery. The hole on the left is open. When I bought the battery, it had a drop of sulfuric acid in the hole (sulfuric acid looks different than water, having a higher index of refraction, and doesn't evaporate very fast). Now you can see sulfate-looking residue. The right side came with a plug.
Below are photos of the left and right sides of my battery. The hole on the left is open. When I bought the battery, it had a drop of sulfuric acid in the hole (sulfuric acid looks different than water, having a higher index of refraction, and doesn't evaporate very fast). Now you can see sulfate-looking residue. The right side came with a plug.
04-28-2016, 01:03 PM
#56
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Even though AGM batteries are sealed, they do have a vent valve in case of excess pressure build up (i.e. due to overcharge condition, etc), similar to a water heater safety valve. In the event that valve is used, the excess hydrogen gas needs to be vented to the atmosphere.
04-28-2016, 02:25 PM
#57
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I routed my vent hose to the fuel tank so I get hydrogenated fuel...good for at least 30-40 HP more I figure. I also keep my used batteries and throw them in the pool. The slow drain of sulfuric acid keeps the water pristine.
05-07-2016, 04:48 PM
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Instead, I had a nut welded to the bottom of my tray. See photo. The nut is the same size as the threaded holes, and the original bolt fits just fine. Problem solved.
05-08-2016, 02:49 AM
#59
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AGM Batteries for 996s
I purchased an AGM (absorbed glass mat) battery to replace the relatively new battery I received when I purchased my '03 996 C4 Cab in Feb. 2015. The dealer told me: "we just replaced the battery". In fact, it was the smaller size - which fit against the first battery tie down hole under the battery platform. And I used a battery tender and the thing still would often barely start the car.
https://en.wikipedia.org/wiki/VRLA_b...d_glass_mat.29
At my indie on my last oil change, the very experienced tech saw the battery and commented: "oh that's one of those new glass mat jobs - they are very good batteries".
I purchased it at Batteries plus Bulbs. I wasn't aware that this place even stocked auto batteries. The specific store I bought it at really didn't know how to physically "tie down" the battery as (reported in this thread) the larger battery did not align with the first tie down hole. My indie tech simply added a nut under the battery tray into which the bolt and the tie down metal plate attached securely.
https://en.wikipedia.org/wiki/VRLA_b...d_glass_mat.29
At my indie on my last oil change, the very experienced tech saw the battery and commented: "oh that's one of those new glass mat jobs - they are very good batteries".
I purchased it at Batteries plus Bulbs. I wasn't aware that this place even stocked auto batteries. The specific store I bought it at really didn't know how to physically "tie down" the battery as (reported in this thread) the larger battery did not align with the first tie down hole. My indie tech simply added a nut under the battery tray into which the bolt and the tie down metal plate attached securely.
