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TOPIC: Battery in 1978 928

Battery in 1978 928 04 Aug 2012 20:08 #9959


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Can someone explane to me how the battery in the 78 928 is secured in the battery box ? I've seen cars with rags, 2x4s assorted pieces of wood, all used to keep the battery secure in the battery box.

I even went to a Porsche dealer and they had no idea, any help would be greatly appreciated.

Mike M
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Battery in 1978 928 06 Aug 2012 20:14 #9992


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It isn't from that curved plate metal bit that is screwed in to the side of the battery box and goes down and holds the lip of the battery??? Not surprised the dealer would be clueless. Did you read the manual for the car??? I bet that would tell you what you need to know. Maybe Jim Doerr of 928 Classics knows...
James
78 Silver / Black-white #295
84 Ruby Red / Black AO84
88 Dark Blue / Linen-Black
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Battery in 1978 928 06 Aug 2012 20:19 #9995


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pcar928fan;10294 wrote:
It isn't from that curved plate metal bit that is screwed in to the side of the battery box and goes down and holds the lip of the battery??? Not surprised the dealer would be clueless. Did you read the manual for the car??? I bet that would tell you what you need to know. Maybe Jim Doerr of 928 Classics knows...

I think you are correct James. If I recall correctly it is a 13m bolt head that pulls the curved piece of metal down with the battery bottom edge between it and the bottom of the battery box. The curved piece of metal is perhaps 2" wide and nearly the same height as the battery is tall.
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Battery in 1978 928 07 Aug 2012 13:20 #10009


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Yup, it is this.

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Battery in 1978 928 07 Aug 2012 17:50 #10015


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In some of my cars that funny shaped tool in the tool kit is for unscrewing that bolt to remove that metal hold down even!
James
78 Silver / Black-white #295
84 Ruby Red / Black AO84
88 Dark Blue / Linen-Black
92 Polar Silver / Dark Blue 92EURO
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Battery in 1978 928 07 Aug 2012 22:27 #10025


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In my cars, it is a allen head bolt that tightens the battery holderand not a hex head bolt. The tool in my tool holder is used to tighten and loosen it.

I looked in PET for the '78 year model and I can't seem to find that battery hold-down piece. I'm wondering if the early early models didn't use this method and that's what the OP is questioning. Somebody that has an OB could help by looking for either the hold-down piece or the bolt hole where the allen bolt would go.
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Battery in 1978 928 08 Aug 2012 06:38 #10027


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I checked the PET as well and there is nothing regarding securing the battery. I also checked the owners manual and all it says is "the battery should be securely mounted"

Thanks for the photo of the securing bracket, in the battery box there is no place to "secure it" The research continues.

Mike
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Battery in 1978 928 08 Aug 2012 08:11 #10029


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I have been driving mine for 10 years without a bracket, gravity seems to be doing just fine.
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Battery in 1978 928 08 Aug 2012 19:28 #10030


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I use a deep cycle yellow top which the stock battery hold down will not work on. I have a very heavy rubber mat cut to the size of the box and the lid holds it down tight onto the battery.
I may get energetic one of these days and make something more professional but until then, this holds it so that there is no chance of it shorting against the lid or side
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Battery in 1978 928 08 Aug 2012 23:57 #10035


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Mike M,
So what you're saying is that there is no bolt hole at the rear on the side of the batter box for the battery hold-down bolt?

If that's the case, maybe there wasn't anything besides gravity holding a '78 battery in place?

Someone with another '78 could help us out with this one. Anybody?
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Battery in 1978 928 09 Aug 2012 01:44 #10037


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I am going to email Jim Doerr... he has a couple he can look at... Of course his are REALLY, REALLY early EURO cars, but we will hope for the best.
James
78 Silver / Black-white #295
84 Ruby Red / Black AO84
88 Dark Blue / Linen-Black
92 Polar Silver / Dark Blue 92EURO
93 Arrow Blue / Black
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Battery in 1978 928 09 Aug 2012 08:35 #10038


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John.
That is what I'm saying. There is no hole in the battery box to secure the battery.
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Battery in 1978 928 09 Aug 2012 08:39 #10039


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Mike, How about a photo of the battery box, so we can attempt to determine if it has been replaced or modified?
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Battery in 1978 928 09 Aug 2012 15:58 #10041


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Stan, I'll send you a photo tomorrow. Mike
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Battery in 1978 928 13 Aug 2012 21:28 #10087


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Hey Mike, I am also a Mike M....! Welcome

My 83 does not have a securing mechanism either. It has drain holes in the bottom, but I see nothing to attach anything to. I also have a deep cycle Yellow top like Brad so a bracket probably would not fit anyway,,,,I just have enough clearance to close the compartment and there is only a little room on each side. So it is all gravity for me as well. The only place there is a little room for movement is back to front. And since I have put in a 0 gauge battery cable,,,it does not move much :)

I did spray the entire battery compartment with spay bed liner to prevent rust and keep the top from possibly arcing out on the lid if something heavy went in the back by mistake and bent the lid.
1983 928S - 16v 4.7L L-Jetronic
Dark Grey w/ Blue Leather
85/86 exhaust manifolds
Y-Pipe
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VIN: WP0JB0926DS861180
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Battery in 1978 928 15 Aug 2012 12:15 #10165


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Porsche document 4582.21, 928 Service Information, one of the first books issued covering the 928, shows a photo of the opened battery box. It shows a fitted metal lid covering the entire battery, apparently held down by four screws. There are two screws on each of the long sides of the cover.

Remember that the battery box is not part of the body on the early cars, but is a separate box bolted to the transaxle...
Wally Plumley
928 Specialists
www.928gt.com
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Battery in 1978 928 15 Aug 2012 17:09 #10182


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Wally, I did not know that. Very interesting! I think I have seen that though on one of those 928's without the body...the kind of deal that shows off all the "guts" of the car...
James
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Battery in 1978 928 19 Aug 2012 20:10 #10305


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Wally is correct. Mt 78 does not have the battery hold down like my later cars did. There are no holes for one either. Instead, gravity, and the lid to the battery box, hold it in just fine.
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Battery in 1978 928 19 Aug 2012 22:43 #10311


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I would assume that the lid must have an insulating layer, probably rubber. Otherwise, a roll-over accident would have disastrous consequences.

Wally Plumley
928 Specialists
www.928gt.com
Wally Plumley
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www.928gt.com
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Battery in 1978 928 20 Aug 2012 07:42 #10316


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wallyp;10631 wrote:
I would assume that the lid must have an insulating layer, probably rubber. Otherwise, a roll-over accident would have disastrous consequences.

Wally Plumley
928 Specialists
www.928gt.com

Wow. Now wouldn't that be something? It would be quite a chore to roll a 928 over I would think. With it's broad stance, short ride height, and 50/50 weight balance I would think it to be nearly impossible.
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Battery in 1978 928 20 Aug 2012 08:10 #10317


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I can't believe that any competent business would overlook such an obvious possibility. It would be totally impossible to defend in court.
Wally Plumley
928 Specialists
www.928gt.com
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Battery in 1978 928 20 Aug 2012 08:30 #10319


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wallyp;10637 wrote:
I can't believe that any competent business would overlook such an obvious possibility. It would be totally impossible to defend in court.

Well, this is undeniable. Good info, Wally. :)
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Battery in 1978 928 20 Aug 2012 09:42 #10321


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That is why I put a heavy rubber mat over my battery. I actually have to tuck it under the lip and there is no chance that when the lid is closed that it can slid away or that the lid can be contacted by the battery.
My lid is metal with no coating so I took the precaution to remedy that issue
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Battery in 1978 928 21 Aug 2012 07:42 #10335


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I have never seen an original 1978 battery box cover - it would be interesting to see what Porsche did on this.

Wally Plumley
928 Specialists
www.928gt.com
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Battery in 1978 928 21 Aug 2012 11:09 #10337


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Well, it's good to at least know how it was originally done! I had wondered if the curved bit of metal battery holder was not an afterthought to a potential problem. Apparently it was!
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Battery in 1978 928 25 Aug 2012 22:42 #10588


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wallyp;10656 wrote:
I have never seen an original 1978 battery box cover - it would be interesting to see what Porsche did on this.

Wally Plumley
928 Specialists
www.928gt.com

Mine is original, and it is not rubber coated. There is a rubber seal around the lid to the box, but that won't cure what you are thinking about.
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Battery in 1978 928 25 Aug 2012 22:55 #10590


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linderpat;10920 wrote:
Mine is original, and it is not rubber coated. There is a rubber seal around the lid to the box, but that won't cure what you are thinking about.


Hey Ed would it be possible for you to post a picture for the guys that have never seen one, including me.

Brad
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Battery in 1978 928 26 Aug 2012 06:52 #10592


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928mac;10922 wrote:
Hey Ed would it be possible for you to post a picture for the guys that have never seen one, including me.

Brad

I'll take one today and put it up.
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Battery in 1978 928 26 Aug 2012 19:25 #10610


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Here are a few pictures. Note, the underside of the battery box lid shows 2 rubber strips located above where the battery terminals would be. Thus, there is some measure of insulation protection (my memory was off on this). Also, see how the battery box is attached from below. Lastly, the rust looking stuff in the area of the battery box opening isn't rust, but cosmoline - which is everywhere on these cars from the factory for overseas shipping.

Attached files
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Battery in 1978 928 26 Aug 2012 22:18 #10620


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Very interesting... Never seen anything like it! I wonder what my '78 has?!
James
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84 Ruby Red / Black AO84
88 Dark Blue / Linen-Black
92 Polar Silver / Dark Blue 92EURO
93 Arrow Blue / Black
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Battery in 1978 928 26 Aug 2012 23:15 #10632


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Wow that is cool. It is separate but it also has rubber to protect it.
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