Battery in 1978 928

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04 Aug 2012 20:08 #9959 by mike m
Battery in 1978 928 was created by mike m
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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06 Aug 2012 20:14 #9992 by pcar928fan
Replied by pcar928fan on topic Battery in 1978 928
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
92 Polar Silver / Dark Blue 92EURO
93 Arrow Blue / Black

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06 Aug 2012 20:19 #9995 by srshaw3
Replied by srshaw3 on topic Battery in 1978 928

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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07 Aug 2012 13:20 #10009 by SeanR
Replied by SeanR on topic Battery in 1978 928
Yup, it is this.

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07 Aug 2012 17:50 #10015 by pcar928fan
Replied by pcar928fan on topic Battery in 1978 928
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
93 Arrow Blue / Black

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07 Aug 2012 22:27 #10025 by xstepson
Replied by xstepson on topic Battery in 1978 928
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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08 Aug 2012 06:38 #10027 by mike m
Replied by mike m on topic Battery in 1978 928
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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08 Aug 2012 08:11 #10029 by denhamfly
Replied by denhamfly on topic Battery in 1978 928
I have been driving mine for 10 years without a bracket, gravity seems to be doing just fine.

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08 Aug 2012 19:28 #10030 by 928mac
Replied by 928mac on topic Battery in 1978 928
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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08 Aug 2012 23:57 #10035 by xstepson
Replied by xstepson on topic Battery in 1978 928
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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09 Aug 2012 01:44 #10037 by pcar928fan
Replied by pcar928fan on topic Battery in 1978 928
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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09 Aug 2012 08:35 #10038 by mike m
Replied by mike m on topic Battery in 1978 928
John.
That is what I'm saying. There is no hole in the battery box to secure the battery.

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09 Aug 2012 08:39 #10039 by srshaw3
Replied by srshaw3 on topic Battery in 1978 928
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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09 Aug 2012 15:58 #10041 by mike m
Replied by mike m on topic Battery in 1978 928
Stan, I'll send you a photo tomorrow. Mike

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13 Aug 2012 21:28 #10087 by mm928
Replied by mm928 on topic Battery in 1978 928
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
SS Hi-perf Cat
S4 springs
Bilstein shocks
Air pump delete
VIN: WP0JB0926DS861180
- - Isn't Life great? - -

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15 Aug 2012 12:15 #10165 by wallyp
Replied by wallyp on topic Battery in 1978 928
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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15 Aug 2012 17:09 #10182 by pcar928fan
Replied by pcar928fan on topic Battery in 1978 928
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
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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19 Aug 2012 20:10 #10305 by linderpat
Replied by linderpat on topic Battery in 1978 928
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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19 Aug 2012 22:43 #10311 by wallyp
Replied by wallyp on topic Battery in 1978 928
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
928 Specialists
www.928gt.com

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20 Aug 2012 07:42 #10316 by Kiln_Red
Replied by Kiln_Red on topic Battery in 1978 928

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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20 Aug 2012 08:10 #10317 by wallyp
Replied by wallyp on topic Battery in 1978 928
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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20 Aug 2012 08:30 #10319 by Kiln_Red
Replied by Kiln_Red on topic Battery in 1978 928

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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20 Aug 2012 09:42 #10321 by 928mac
Replied by 928mac on topic Battery in 1978 928
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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21 Aug 2012 07:42 #10335 by wallyp
Replied by wallyp on topic Battery in 1978 928
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

Wally Plumley
928 Specialists
www.928gt.com

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21 Aug 2012 11:09 #10337 by xstepson
Replied by xstepson on topic Battery in 1978 928
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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25 Aug 2012 22:42 #10588 by linderpat
Replied by linderpat on topic Battery in 1978 928

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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25 Aug 2012 22:55 #10590 by 928mac
Replied by 928mac on topic Battery in 1978 928

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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26 Aug 2012 06:52 #10592 by linderpat
Replied by linderpat on topic Battery in 1978 928

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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26 Aug 2012 19:25 #10610 by linderpat
Replied by linderpat on topic Battery in 1978 928
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 [img]media/attachments/10942=1285-blumaxx bateery box 004.jpg[/img] [img]media/attachments/10942=1284-blumaxx bateery box 005.jpg[/img] [img]media/attachments/10942=1286-blumaxx bateery box 009.jpg[/img] [img]media/attachments/10942=1287-blumaxx bateery box 016.jpg[/img] [img]media/attachments/10942=1288-blumaxx battery box 003.jpg[/img]

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26 Aug 2012 22:18 #10620 by pcar928fan
Replied by pcar928fan on topic Battery in 1978 928
Very interesting... Never seen anything like it! I wonder what my '78 has?!

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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26 Aug 2012 23:15 #10632 by 928mac
Replied by 928mac on topic Battery in 1978 928
Wow that is cool. It is separate but it also has rubber to protect it.

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