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Scorpion1110
Samba Member
Joined: May 17, 2020
Posts: 43
Location: Maryland 21771
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 Posted: Thu Aug 05, 2021 4:54 pm Post subject: Spark Plug Sleeve? |
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So, I ordered a set of plugs for the Type 3. They came in as Bosch W8AC. Pulled the first plug out and saw it was a W8. Looked at it and saw the shank was fatter than the ones I ordered. Figured I messed up.
Ran to the parts store and they had NGKs. Looked at them and they were small shank. Hmmm. Must be a scarce part.
So I started doing plug cross-references and landed at Summit. Spec'd out the plugs and they are 14mm plugs which is roughly 1/2".
So I looked at the plug again and
Plug sleeve. Pulled another plug and it's about a 1/2 inch shank. Great.
Here are some pics. I see thread sleeves online and they said you have to remove the heads. That wasn't really part of the plan at the moment. Does anyone have any thoughts? The last pic is a normal plug.
Thanks, Dave
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rustyfastback
Samba Member
Joined: July 31, 2002
Posts: 839
Location: Georgia
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| Posted: Thu Aug 05, 2021 5:24 pm Post subject: Re: Spark Plug Sleeve? |
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| I had the same insert for an engine I bought. Luckily I work at NAPA & we had a KD spark plug insert that worked perfectly. I would have to check but I think the part # is 2127 (SER) line. I will try to check tomorrow when I am at work. |
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Scorpion1110
Samba Member
Joined: May 17, 2020
Posts: 43
Location: Maryland 21771
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| Posted: Thu Aug 05, 2021 5:34 pm Post subject: Re: Spark Plug Sleeve? |
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RustyFB:
I appreciate your help 
I managed to get the insert off the plug and would guess that if I can match the insert, I can use the plug to insert and red Loctite the threads. A small swipe of anti-seize on the plug threads so the son of a gun plug can come out free.
I am hesitant to reuse the insert as it's pretty crunchy around the top. My guess is it came out with several plug changes and the PO vice-gripped it off. Like I had to do.
Beginning to think the type 3 is slightly possessed  |
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Scorpion1110
Samba Member
Joined: May 17, 2020
Posts: 43
Location: Maryland 21771
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| Posted: Sat Aug 07, 2021 10:37 am Post subject: Re: Spark Plug Sleeve? |
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So, I visited Napa and checked out their thread inserts.
They are 16mm OD and the plug I have was wearing an 18mm OD insert. So back home to figure it out. Realized I hadn't pulled the two rear plugs, so I pulled them and found 1 insert one not. And insert no 2 was on the same head as number one and insert no 2 was 16mm. What a mess.
So I ordered 2 online from one place (16mm) and tried to grab 2 more from another (18mm). We will see what I get.
Wondering if the driver side should get a new head- getting that PO cobbed the motor together feeling.
Dave |
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Bobnotch
Samba Member
Joined: July 06, 2003
Posts: 22399
Location: Kimball, Mi
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| Posted: Sat Aug 07, 2021 11:46 am Post subject: Re: Spark Plug Sleeve? |
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| Scorpion1110 wrote: |
So, I visited Napa and checked out their thread inserts.
They are 16mm OD and the plug I have was wearing an 18mm OD insert. So back home to figure it out. Realized I hadn't pulled the two rear plugs, so I pulled them and found 1 insert one not. And insert no 2 was on the same head as number one and insert no 2 was 16mm. What a mess.
So I ordered 2 online from one place (16mm) and tried to grab 2 more from another (18mm). We will see what I get.
Wondering if the driver side should get a new head- getting that PO cobbed the motor together feeling.
Dave |
What someone did was insert the plug "sleeves" to keep using that head. They more than likely stripped the threads out doing a plug change. So use a heli-coil, others use an insert. It's really up to you if you decide to replace the heads. I'd probably pull the worst head, and take it to a machinist, and see what they say. Get them to check the head(s) over real good, and look for cracks too. That might give you a better feel about them.
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