Stihl EDT 8 Tachometer - battery replacement

[morten]

I have just recently purchased a Stihl EDT 8 tachometer to ease my mind when adjusting the carb's "H" screw.

 

I knew beforehand that the battery is non-replacable (supposedly), but have also heard that if you cut the case open, it contains a fairly standard lithium battery that is easily replaced, should you ever need to, although you would need to glue/tape the box back together again.

 

I know that the battery is supposed to last for 5 years, but I'm fairly keen on getting inside the tach to see what's inside. Has any of you guys ever tried breaking/cutting open the EDT-7/8 box, and can give some hints to where to make the "cut"?

 

In any case, I'll have a go, and post some photos in this thread of the process to (hopefully) act as a guide to anyone else who some day may have to replace the battery rather than buying a new tach.

 

In any case, I find it a bit strange, that Stihl (or whoever designed and manufactured the EDT 8) has chosen to glue together the box rather than putting in a couple of screws. I know it reduces the cost by about a penny, but come on guys, it's silly.

[spudulike]

I have just recently purchased a Stihl EDT 8 tachometer to ease my mind when adjusting the carb's "H" screw.

 

I knew beforehand that the battery is non-replacable (supposedly), but have also heard that if you cut the case open, it contains a fairly standard lithium battery that is easily replaced, should you ever need to, although you would need to glue/tape the box back together again.

 

I know that the battery is supposed to last for 5 years, but I'm fairly keen on getting inside the tach to see what's inside. Has any of you guys ever tried breaking/cutting open the EDT-7/8 box, and can give some hints to where to make the "cut"?

 

In any case, I'll have a go, and post some photos in this thread of the process to (hopefully) act as a guide to anyone else who some day may have to replace the battery rather than buying a new tach.

 

In any case, I find it a bit strange, that Stihl (or whoever designed and manufactured the EDT 8) has chosen to glue together the box rather than putting in a couple of screws. I know it reduces the cost by about a penny, but come on guys, it's silly.

 

I have heard that there is a way of boring a hole in the back of the case and revealing the battery - would wait for it to run out first though and fully agree - mine is sealed and will take it appart once the battery has gone!

[mikecotterill]

Did you buy that new? Just wondering what the list price is as my 260 sounds lokie it's running a bit quick

[spudulike]

Did you buy that new? Just wondering what the list price is as my 260 sounds lokie it's running a bit quick

 

If you think it is then give the H screw a 1/4 of a turn counter clockwise until you can get it tached - worst you will do is to make it flub a bit on the top end and is better than seizing it:thumbup1:

[morten]

Did you buy that new? Just wondering what the list price is as my 260 sounds lokie it's running a bit quick

 

I got it new via mail order from Germany, as my local Danish Stihl pusher couldn't be bothered to order one for me, and paid €80 (approx GBP 70).

 

https://www.wmv-dresden-shop.de/shop/show_artikel.php?ARTNR=4061118&offset=0

[Cut4fun]

Here is a thread I did on my Chainsawrepair site. The 7 and 8 are just to slow for the money IMHO. Lot better and faster tachs on the market.

Here is link to thread. Chainsaw Tachometer choices