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Author Topic: Tappet Cover broken  (Read 843 times)

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Offline Can550

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Tappet Cover broken
« on: August 12, 2018, 08:34:47 PM »
Quick question on a broken tappet cover (CB550)

I have two tappet covers that have crack and a little chip holes in them, would it make any difference in running of engine? by sucking extra air?

Thanks,
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Offline Gurp

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Re: Tappet Cover broken
« Reply #1 on: August 12, 2018, 08:43:01 PM »
Probably wont make a difference in running butbthats a easy place to get moisture into your engine.
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Offline Bankerdanny

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Re: Tappet Cover broken
« Reply #2 on: August 12, 2018, 09:13:03 PM »
They just seal the holes, nothing structural. Still, you can get brand new ones from David Silver Spares and 4into1 and a number of other places, and there are plenty of used ones on EBay. I would just pick up a couple replacements for the long-term.
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Offline RAFster122s

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Re: Tappet Cover broken
« Reply #3 on: August 13, 2018, 01:20:47 AM »
If they seize a broken one can be a real pita to remove.  But that would be true if it were not broken... 
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Offline Little_Phil

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Re: Tappet Cover broken
« Reply #4 on: August 13, 2018, 01:26:46 AM »
Same caps as lots of small Hondas, 50cc etc. Use 6 sided drive only on them as they always seem 16.8mm head!
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Offline Gurp

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Re: Tappet Cover broken
« Reply #5 on: August 13, 2018, 04:23:44 AM »
Quote from: Little_Phil on August 13, 2018, 01:26:46 AM
Same caps as lots of small Hondas, 50cc etc. Use 6 sided drive only on them as they always seem 16.8mm head!

16.8... that explains my troube getting the ones a PO over tightened off my 500.....
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Offline Can550

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Re: Tappet Cover broken
« Reply #6 on: August 15, 2018, 10:03:28 PM »
Thanks everyone
I had ordered new caps but just wanted to ensure that leaky cover isn’t like leaky carb boot.


Sent from my iPhone using Tapatalk
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Offline dave500

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Re: Tappet Cover broken
« Reply #7 on: August 16, 2018, 12:29:54 AM »
get a cheap six side socket and grind the opening so the lead in ramps are gone like the one on the left here.
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Offline Gordon

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Re: Tappet Cover broken
« Reply #8 on: August 16, 2018, 05:27:34 AM »
When installing the new ones keep in mind that they're just oil seals and should only be put on snug, not super tight.  That huge "nut" on top tends to make a lot of people assume they need to be really cranked down. 
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Offline evanphi

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Re: Tappet Cover broken
« Reply #9 on: August 16, 2018, 06:42:42 AM »
Quote from: dave500 on August 16, 2018, 12:29:54 AM
get a cheap six side socket and grind the opening so the lead in ramps are gone like the one on the left here.

Smaht!

Then just tighten it by hand, or at most a finger ratchet.
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Offline SOHC4 Cafe Racer Fan

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Re: Tappet Cover broken
« Reply #10 on: August 16, 2018, 08:38:18 AM »
Quote from: Gordon on August 16, 2018, 05:27:34 AM
When installing the new ones keep in mind that they're just oil seals and should only be put on snug, not super tight.  That huge "nut" on top tends to make a lot of people assume they need to be really cranked down.

+1

I don't know why so many people assume they need to torque these covers down.
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1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
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"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline Gordon

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Re: Tappet Cover broken
« Reply #11 on: August 16, 2018, 10:25:55 AM »
Quote from: SOHC4 Cafe Racer Fan on August 16, 2018, 08:38:18 AM
Quote from: Gordon on August 16, 2018, 05:27:34 AM
When installing the new ones keep in mind that they're just oil seals and should only be put on snug, not super tight.  That huge "nut" on top tends to make a lot of people assume they need to be really cranked down.

+1

I don't know why so many people assume they need to torque these covers down.

A lot of it's probably due to people trying to stop a leaky tappet cover by tightening it instead of just replacing the old seal. 
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Offline SOHC4 Cafe Racer Fan

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Re: Tappet Cover broken
« Reply #12 on: August 16, 2018, 10:34:09 AM »
Quote from: Gordon on August 16, 2018, 10:25:55 AM
Quote from: SOHC4 Cafe Racer Fan on August 16, 2018, 08:38:18 AM
Quote from: Gordon on August 16, 2018, 05:27:34 AM
When installing the new ones keep in mind that they're just oil seals and should only be put on snug, not super tight.  That huge "nut" on top tends to make a lot of people assume they need to be really cranked down.

+1

I don't know why so many people assume they need to torque these covers down.

A lot of it's probably due to people trying to stop a leaky tappet cover by tightening it instead of just replacing the old seal.

True.  Also, since covers don't come with seals, many people re-use the old worn out ones.
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1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold
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