ZDZ40s, 50s. problems with spark plug insert?  
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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Gas Engines >> ZDZ40s, 50s. problems with spark plug insert?
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ZDZ40s, 50s. problems with spark plug insert? - 3/6/2003 5:35:40 AM   
MarkNovack



Posts: 1547
Joined: 2/9/2002
From: Nameche, BELGIUM
Status: offline 		We had a customer in the shop today that has seen quite a few ZDZ40 cc motors with failing spark plug inserts.

Does anyone here have any experience in seeing the same thing and is this perhaps something to watch out for on the new 50. The store at which I purchased mine said to be very careful with tightening the plug.

Please let me know if anyone else has experienced this condition and what the cause was.


Thanks,
Mark
       Post #: 1

ZDZ40s, 50s. problems with spark plug insert? - 3/6/2003 7:18:42 AM   
Diablo-RCU


 

Posts: 3208
Joined: 12/19/2001
From: Hammond, IN, USA
Status: offline 		Like all aluminum head engines, I'd wait until the engine is cold before using a wrench on the plug. Aluminum doesn't have much strength when hot and it's easy to bugger the threads. I'm not sure what you mean by spark plug insert. There is the lower plug shield, but it's pretty stout. Don't know how you'd wreck it.

(in reply to MarkNovack)
       Post #: 2

ZDZ40s, 50s. problems with spark plug insert? - 3/6/2003 7:51:43 AM   
rcign-RCU


 

Posts: 1040
Joined: 12/26/2001
From: Williams, AZ
Status: offline 		Easily fixed with a Heli Coil or a new brass insert from C&H.....

(in reply to MarkNovack)
       Post #: 3

ZDZ40s, 50s. problems with spark plug insert? - 3/6/2003 8:30:39 AM   
BigBirdFlyer



Posts: 281
Joined: 9/3/2002
From: Auburn, WA, USA
Status: offline 		Haven't had any problems with my ZDZ 50 and the plug has been out at least 8 to 10 times. I had problems getting the timing correct.


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Ron C.

(in reply to MarkNovack)
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ZDZ40s, 50s. problems with spark plug insert? - 3/6/2003 8:47:08 AM   
BigBird1



Posts: 759
Joined: 2/26/2002
From: Knoxville, TN, USA
Status: offline 		Try a little something called copper cote....it's a mixture of copper and lube that you apply to the threads of a plug before you screw it in...
Keeps threads from galding and tearing out the threads..great in aluminum...

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I never met a Chaos I didn't like

(in reply to MarkNovack)
       Post #: 5

ZDZ40s, 50s. problems with spark plug insert? - 3/6/2003 8:04:09 PM   
Buzzard Dave



Posts: 142
Joined: 7/26/2002
From: Tampa, FL, USA
Status: offline 		I've had the plug out of my ZDZ40 many times....no problem.


I've got a ZDZ80. i haven't taken the plug out yet...mainly because - i can't! it is tight as can be. i was thinking about trying it with the engine pretty warm.

however, based on what i read above - is that not such a good idea?


David Soniat - Tampa, FL

(in reply to MarkNovack)
       Post #: 6

ZDZ40s, 50s. problems with spark plug insert? - 3/7/2003 1:22:51 AM   
BigBirdFlyer



Posts: 281
Joined: 9/3/2002
From: Auburn, WA, USA
Status: offline 		Is the biplane in your avitar an Ultimate? what size is it.


_____________________________

Ron C.

(in reply to MarkNovack)
       Post #: 7

ZDZ40s, 50s. problems with spark plug insert? - 3/7/2003 1:26:52 AM   
Buzzard Dave



Posts: 142
Joined: 7/26/2002
From: Tampa, FL, USA
Status: offline 		to BigBird Flyer:

Yep, it is an ultimate. an Ohio R/C kit. i believe about 63"WS, 1300 sq.in. I have the ZDZ 40 in it.

The kit was ok, but really overbuilt. it ended up at 17lbs. just too much for the 40.

Ohio R/C is now out of business as I understand it.....

David Soniat

(in reply to MarkNovack)
       Post #: 8

ZDZ40s, 50s. problems with spark plug insert? - 3/7/2003 1:50:19 AM   
BigBirdFlyer



Posts: 281
Joined: 9/3/2002
From: Auburn, WA, USA
Status: offline 		Thanks Dave . I have been looking for a larger Bipe. Maybe 72" to 80 ".
I have a ZDZ 50 in a 16 lb Extra with unlimited power and vertical. You might consider the upgrade.


_____________________________

Ron C.

(in reply to MarkNovack)
       Post #: 9

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