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rfix'n's Avatar
 
Join Date: Aug 2000
Location: Bellingham, WA, USA
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multi-electrode plug gap

How do I set the gap on a multi-electrode spark plug? Bosch FRT5DC plugs, tech-spec book says .7mm they came out of the box with .8mm.

Thanks much,

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Rob Fix
'78 3.6L SC Targa
Eiche Gruen Metallisch
Old 01-01-2004, 08:57 AM
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From the Bosch website
http://www.boschusa.com/AutoParts/FAQs/SparkPlugs/
Q. Are Bosch Spark Plugs pre-gapped at the factory?
A. Most Bosch Spark Plugs are factory pre-gapped for popular vehicle applications. The gap measurements are indicated either on the box, or by the part number located on the spark plug shell.

* X suffix = .044"
* Y suffix = .060"
* Z suffix = .080"

Gaps should never by adjusted on Platinum+4 or Platinum2. Bosch Platinum+4 and Platinum2 have factory pre-set gaps, and should never be gapped by the installer.

Bosch Platinum and Super Spark Plugs also have factory-set gaps. For most plugs, the setting is shown on the plug package. These gaps are correct for the most popular applications of these plugs. There are applications, however, for which the gap setting has to be adjusted according to the vehicle manufacturer’s specifications. To avoid damage to a spark plug in the process of adjusting the gap, it is important to follow these guidelines:

* To widen the electrode gap, use a tool that only pulls back the ground electrode, without applying pressure to the center electrode. The tool must not be wedged between the electrodes as that may cause damage to the insulator nose.
* To close the electrode gap, carefully tap the plug, electrode first, on a hard surface, as shown in the illustration.
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Steve
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Old 01-01-2004, 09:11 AM
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Thanks for the link Steve. The illustration demonstrates tapping the bottom of a Single electrode plug. my Super's are multi-electrode and would have to be tapped on the Side. I want to make Sure it will be okay to do this Since the above link specifically Says not to change the gap on platinum 4's and 2's (I thought the reason for not changing the gap on the platinums might be because they were multi.electrode)

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Rob Fix
'78 3.6L SC Targa
Eiche Gruen Metallisch
Old 01-01-2004, 09:49 AM
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