F355 spark plugs

I would have already designed it that way from the start, John - but it's not possible as the tool needs to be used from both sides of the boot given the access within the cam covers.

I should add - our tool was designed for use with Beru wires / boots

 

Dave, I believe the original Beru wire sets had the single seal. Later sets, whether oem or aftermarket (Kingsborne) were made with the Beru part with five seals, to better keep water out.

 

Thanks, Dave.

I wonder if the head is different? Steve's are Kingsborne and those heads are slightly different than my Beru

 

Dave, could be. Understand that Kingsborne uses Beru parts, but as you can see, not exactly the same as the original Ferrari part. I recall a dealer tech telling me that the style of plug head (five seals) was used either on the later 355s or on the factory replacement wire sets as well. (but I cannot confirm if that is true or not)

 

I need to look over 98.

 

My 355 is a 99 and the original wires have the single seal. I purchased a replacement set that will be going on the car soon and they have the single seal as well. By the way, Dave's tool worked great for me without any issues.

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What was the source for your replacements? Aftermarket or Ferrari? I was looking online, and it appears Beru only sells or offers the plug connector with five seals on their website...the single seal may possibly be only offered to oem manufacturers.

 

They were from Ferrari.

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Thanks. I noticed on yout replacements, Ferrari is no longer offering the wires with printed numbers for the cylinder it is for. Looks like it has the white plastic clips with cylinder designation, like what Kingsborne provides?

 

That is correct, cylinder designation is via a white band with the number printed on it. My 328 wires have something similar.

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Interesting, that is how Kingsborne has been doing it as well. Maybe Beru no longer makes wire with cylinder numbering??

 

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These are the ones from Ricambi
I figured they would have the single seal but I was happy they had the 5 rings
From the look of my plugs it could use extra seals

 

For sealing, it is equally important to have a fresh paper gasket on the cam cover top, as well as the foam blocks on the rear where the wires enter the cam cover. My car was missing the foam blocks when I purchased it, and developed a miss a couple years later. When I replaced the spark plugs, the rear most plugs on each bank were rather rusty from water instrusion. New foam blocks, paper gaskets and spark plugs fixed it right up. Never had an issue for the next 8 years over ownership with rusty plugs....and yes, I drove in the rain occasionally.

 

Those are rubber, not foam, Dave

 

Thanks for the correction Dave!

 

I was just gonna ask that since mine are rubber as well.
I did do all that but thus service couple plugs on each side were a bit rusty. I did notice that some of the allen bolts were rather loose so thus time I will tighten after a few days when they are in

 

And on my car they were further sealed with a sealed with a dab of silicon.