2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

broken spark plug

Old Dec 16, 2011 | 04:50 PM
  #26  
HOZZMANRX7's Avatar
Driving RX7's since 1979
Tenured Member 20 Years
iTrader: (43)
 
Joined: Aug 2001
Posts: 6,096
Likes: 9
From: So Cal where the OC/LA/SB counties meet
Originally Posted by mikey1992
well i did the swap with an engine that was sitting for 4 years and i think i used those spark plugs, plus another plug was cracked on the white part when i took it out. Ima try to crank it over by hand to see what's up.
With the engine out of the engine bay so you can use gravity can help you out. Right?
Reply
Old Dec 16, 2011 | 05:19 PM
  #27  
SpikeDerailed's Avatar
This sh*t burns oil!
Tenured Member: 15 Years
iTrader: (7)
 
Joined: Oct 2006
Posts: 1,239
Likes: 5
From: Charlotte, NC - USA
Originally Posted by PvillKnight7
Sounds like a good guideline. I think I do less than 1/2 a turn after hand tight. More like 1/4.
Thats how I do it, with a little antiseize.
Reply
Old Dec 16, 2011 | 09:53 PM
  #28  
MIDNFauciUSN's Avatar
Roll FIS green
iTrader: (8)
 
Joined: Mar 2003
Posts: 1,738
Likes: 14
From: Jax, FL
And while we're on the subject... good engineering practice is to screw the plugs in with your fingers... NOT an air tool. I'd say accidental cross threading occurs about as often as seizing.
Reply
Old Dec 16, 2011 | 11:20 PM
  #29  
SirCygnus's Avatar
whats going on?
Tenured Member 20 Years
iTrader: (1)
 
Joined: Mar 2004
Posts: 4,930
Likes: 8
From: atlanta ga
i always wiggle them in when they start to get tight. if they dont go in more with the wiggling method, i try again.
Reply
Old Dec 17, 2011 | 02:31 AM
  #30  
Black Knight RX7 FC3S's Avatar
Turbo power, activate!
Tenured Member: 20 Years
Liked
Loved
iTrader: (7)
 
Joined: Nov 2002
Posts: 1,708
Likes: 6
From: Philadelphia
i always tell my cousin to never use air tools to put the spark plug in the engine, and what does he go and do, he use an air ratchet to take the spark plugs out.......I gave him a smack and tell him to never use air tool removing or installing spark plugs LOL
Reply
Old Dec 17, 2011 | 11:58 AM
  #31  
mikey1992's Avatar
Thread Starter
No Sleep
Tenured Member 05 Years
 
Joined: Feb 2011
Posts: 272
Likes: 1
From: Houston, TX
Ima pull the engine out and open it up to see wtf is up. Never had experience opening an engine especially a rotary so we'll see how it goes.
Reply
Old Dec 17, 2011 | 12:30 PM
  #32  
AGreen's Avatar
Trunk Ornament
Tenured Member: 15 Years
iTrader: (11)
 
Joined: Sep 2006
Posts: 3,054
Likes: 2
From: Goose Creek, SC
What did you use to extract the spark plug? If it was a welder, I have to wonder where you placed the electrode. A lot of people don't understand that when welding on something that has moving parts, you don't place the electrode in a position that allows current to flow through something that moves. i.e. when welding a differential, don't just place the electrode on the case and weld the spider gears, it'll destroy the bearings. Same goes for the engine. Placing the electrode on front pulley (for instance) and welding on something else would destroy the eccentric shaft bearings, etc.

If you used a bolt extractor, then the likelihood of jamming something (porcelain, metal) inside the engine is pretty damn good. I've rescued numerous engines from certain doom by taking a little time to do things properly.
Reply
Old Dec 17, 2011 | 05:10 PM
  #33  
RotaryEvolution's Avatar
Sharp Claws
Tenured Member 15 Years
iTrader: (30)
 
Joined: Oct 2003
Posts: 5,107
Likes: 50
From: Central Florida
Originally Posted by Black Knight RX7 FC3S
i always tell my cousin to never use air tools to put the spark plug in the engine, and what does he go and do, he use an air ratchet to take the spark plugs out.......I gave him a smack and tell him to never use air tool removing or installing spark plugs LOL
i used to use my air ratchet to remove plugs all the time. not one issue.

i also used to use it to install them..

AFTER installing the plugs a few threads by finger.

course i didn't crank down on them, just seated them and gave it a nudge by hand.
Reply
Old Dec 18, 2011 | 01:51 AM
  #34  
mikey1992's Avatar
Thread Starter
No Sleep
Tenured Member 05 Years
 
Joined: Feb 2011
Posts: 272
Likes: 1
From: Houston, TX
ok took the engine apart and the rear rotor and housing are fucked. So they are getting replaced! will post up pics.
Reply
Old Dec 18, 2011 | 12:10 PM
  #35  
RotaryEvolution's Avatar
Sharp Claws
Tenured Member 15 Years
iTrader: (30)
 
Joined: Oct 2003
Posts: 5,107
Likes: 50
From: Central Florida
we demand pics nao!
Reply
Old Dec 18, 2011 | 12:17 PM
  #36  
j9fd3s's Avatar
Moderator
Community Builder
Liked
Loved
Community Favorite
iTrader: (3)
 
Joined: Mar 2001
Posts: 31,811
Likes: 3,216
From: https://www2.mazda.com/en/100th/
we used to have a tech who used his electric impact gun to put spark plugs in, which is ok, but the battery goes flat, and then it doesn't tighten the plugs! so they used to fly out (and wheels fall off)
Reply
Old Dec 18, 2011 | 12:37 PM
  #37  
RotaryEvolution's Avatar
Sharp Claws
Tenured Member 15 Years
iTrader: (30)
 
Joined: Oct 2003
Posts: 5,107
Likes: 50
From: Central Florida
Originally Posted by j9fd3s
we used to have a tech who used his electric impact gun to put spark plugs in, which is ok, but the battery goes flat, and then it doesn't tighten the plugs! so they used to fly out (and wheels fall off)
meh, impact isn't a good idea, it vibrates the socket and can shatter the porcelain if the socket touches the tip of the plug.
Reply
Old Dec 18, 2011 | 08:13 PM
  #38  
mikey1992's Avatar
Thread Starter
No Sleep
Tenured Member 05 Years
 
Joined: Feb 2011
Posts: 272
Likes: 1
From: Houston, TX
https://www.rx7club.com/album.php?al...0&ref=gnr-prev

https://www.rx7club.com/album.php?al...0&ref=gnr-prev

https://www.rx7club.com/album.php?al...0&ref=gnr-prev

https://www.rx7club.com/album.php?al...0&ref=gnr-prev

https://www.rx7club.com/album.php?al...0&ref=gnr-prev

Last edited by mikey1992; Dec 18, 2011 at 08:18 PM.
Reply
Old Dec 18, 2011 | 08:32 PM
  #39  
MIDNFauciUSN's Avatar
Roll FIS green
iTrader: (8)
 
Joined: Mar 2003
Posts: 1,738
Likes: 14
From: Jax, FL
that'll buff out!
Reply
Old Dec 18, 2011 | 08:37 PM
  #40  
dwb87's Avatar
This is my social media.
Tenured Member 15 Years
iTrader: (22)
 
Joined: Jan 2006
Posts: 2,744
Likes: 0
From: WA
Ouch! Better luck next time? Man, I am sorry to see that... Hope you get it up and running again, soon.
Reply
Old Dec 18, 2011 | 09:36 PM
  #41  
PvillKnight7's Avatar
Rotary Freak
Tenured Member: 20 Years
iTrader: (16)
 
Joined: May 2002
Posts: 2,597
Likes: 3
From: Maryland
If the only damage is in that area just above the exhaust port you could still use that housing. Any damage to the apex seals or grooves?
Reply
Old Dec 19, 2011 | 11:40 AM
  #42  
mikey1992's Avatar
Thread Starter
No Sleep
Tenured Member 05 Years
 
Joined: Feb 2011
Posts: 272
Likes: 1
From: Houston, TX
yeah two of the apex seals got nicked by the bolt extractor but are still good. During disassembly the water jacket seals popped out and were stretched. Theres a kit on atkins for like 150.
Reply
Old Dec 19, 2011 | 11:50 AM
  #43  
stevensimon's Avatar
Banned. I got OWNED!!!
iTrader: (11)
 
Joined: Aug 2003
Posts: 3,575
Likes: 6
From: salt lake ut
wait.. here i was all feeling bad for being somewhat responsible for your fucked engine but then
...

how did the extractor "nick" two apex seals? what exactly did you do? i did this procedure with absolutely no problem..
Reply
Old Dec 19, 2011 | 12:04 PM
  #44  
mikey1992's Avatar
Thread Starter
No Sleep
Tenured Member 05 Years
 
Joined: Feb 2011
Posts: 272
Likes: 1
From: Houston, TX
The extractor went through the trailing plug hole and broke inside the rotor.
Reply
Old Dec 19, 2011 | 12:09 PM
  #45  
RotaryEvolution's Avatar
Sharp Claws
Tenured Member 15 Years
iTrader: (30)
 
Joined: Oct 2003
Posts: 5,107
Likes: 50
From: Central Florida
and you rotated the engine anyways?

eh, oh well. i gave my best answer in my first reply.

you can lead a horse to water but... you know the rest.
Reply
Old Dec 19, 2011 | 12:20 PM
  #46  
mikey1992's Avatar
Thread Starter
No Sleep
Tenured Member 05 Years
 
Joined: Feb 2011
Posts: 272
Likes: 1
From: Houston, TX
Well i didn't know it broke. My brother and my friend pulled out the spark plug while i was at work then cranked it over. I'm not mad that any of this happened cuz it's all a learning experience. I just ordered the gasket kit off of atkins should be here in two days.
Reply
Old Dec 19, 2011 | 12:25 PM
  #47  
RotaryEvolution's Avatar
Sharp Claws
Tenured Member 15 Years
iTrader: (30)
 
Joined: Oct 2003
Posts: 5,107
Likes: 50
From: Central Florida
Originally Posted by PvillKnight7
If the only damage is in that area just above the exhaust port you could still use that housing. Any damage to the apex seals or grooves?
possibly, but it still would require some deburring, the rotor as well, and a whole new set of seals.
Reply
Old Dec 19, 2011 | 12:47 PM
  #48  
incubuseva's Avatar
Boost knob
Tenured Member 15 Years
iTrader: (13)
 
Joined: Feb 2004
Posts: 1,716
Likes: 2
From: Lake Stevens
More importantly how the hell did this break off to begin with?

I had a bad lot of plugs once. Had two of them break off just as the crush washer was compressing. Luckily I used an easy out and got them out with no damage. I returned the rest of the plugs for new ones.

You can always use a q tip with grease to try to chase out most of the shavings too, but I wouldn't recommend this on a rotary because of the bathtub shaped combustion chamber.
Reply
Old Dec 19, 2011 | 04:39 PM
  #49  
mikey1992's Avatar
Thread Starter
No Sleep
Tenured Member 05 Years
 
Joined: Feb 2011
Posts: 272
Likes: 1
From: Houston, TX
We're replacing the housing and rotor with the gasket seal kit from atkins. I'll post more pics when the parts come in.
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
whinin
New Member RX-7 Technical
10
Sep 5, 2015 11:52 PM
TwentyDW
2nd Generation Specific (1986-1992)
4
Sep 2, 2015 06:42 PM


Thread Tools
Search this Thread

All times are GMT -5. The time now is 04:24 PM.