Home Model Engine Machinist > Building Them > Questions and Answers > Loctite, which one?
Reply
 
LinkBack Thread Tools Display Modes
Old 01-30-2011, 06:06 PM   #1
DaveRC
 
Join Date: Dec 2010
Posts: 83
Liked 6 Times on 6 Posts

Default Loctite, which one?

Loctite, which one just can't work out what I need

I need to loctite in some valve guides, bronze into aluminium.

I see people on here use Loctite for all sorts, I have never used it before, what do I get and how do you use it?

Thanks

Dave



__________________
DaveRC is offline  
 
Reply With Quote Quick reply to this message
Old 01-30-2011, 06:18 PM   #2
Metal Butcher
Project of the Month Winner!!!
 
Join Date: Dec 2008
Posts: 1,731
Liked 66 Times on 66 Posts

Default Re: Loctite, which one?

Quote:
Originally Posted by DaveRC
Loctite, which one just can't work out what I need

I need to loctite in some valve guides, bronze into aluminium.

I see people on here use Loctite for all sorts, I have never used it before, what do I get and how do you use it?

Thanks

Dave
Dave, their are quite a few Loctite numbers that could work. But, If your parts span between a press fit and up to .005" gap, then I recommend #609. It has the correct viscosity to coat the surfaces properly. And its makes for a very strong joint. Its the one I use on all my work.

To use Loctite its important to degrease both parts with lacquer thinner (or equivalent) , coat both parts on their mating surfaces and install a with a one direction twist, or press them together quickly in one motion if the gap is a press fit. The closer the gap, the quicker it sets up. In the case of a press fit their will be no time to make any adjustments. You got to get it right on the first try.

-MB


__________________

In Constant Pursuit Of Perfection

Metal Butcher is offline  
 
Reply With Quote Quick reply to this message
Old 01-30-2011, 06:28 PM   #3
dieselpilot
HMEM_SUPPORTER.png
 
Join Date: Jan 2009
Location: Chicagoland
Posts: 1,130
Liked 79 Times on 72 Posts

Default Re: Loctite, which one?

609 will probably be fine in a model engine, but if you expect the head to get hot you should consider the high temperature retaining compound, #620.

__________________
dieselpilot is offline  
 
Reply With Quote Quick reply to this message
Old 01-30-2011, 08:39 PM   #4
Deanofid
 
Join Date: Jul 2009
Location: Idaho, USA
Posts: 2,673
Liked 150 Times on 147 Posts
Likes Given: 5

Default Re: Loctite, which one?

Sleeve retainer. Both Loctite and Permatex make a version. They are specifically made for things like bonding piston sleeves and valve guides.
The Loctite number is 620 Retaining Compound.
The Permatex kind is just called High Temperature Sleeve Retainer.

__________________
Deanofid is offline  
 
Reply With Quote Quick reply to this message
Old 01-30-2011, 09:19 PM   #5
Metal Butcher
Project of the Month Winner!!!
 
Join Date: Dec 2008
Posts: 1,731
Liked 66 Times on 66 Posts

Default Re: Loctite, which one?

I withdraw my suggestion of using Loctite # 609 to secure valve guides on an I.C. engine.

Deanofid and dieselpilot are correct with their recommendation.

I checked on the temperature ratings and Loctite #609 is rated at only 300 degrees Fahrenheit.

And the #620 is rated at 450-F.

-MB

__________________

In Constant Pursuit Of Perfection

Metal Butcher is offline  
 
Reply With Quote Quick reply to this message
Old 01-31-2011, 08:26 AM   #6
DaveRC
 
Join Date: Dec 2010
Posts: 83
Liked 6 Times on 6 Posts

Default Re: Loctite, which one?

Thanks guys, good information as usual, now hunting for 620, any clues where to get this stuff. Have had a hunt on the net and it only seems to be in 250ml bottles (at over £100 ) can't seem to fin small bottles of the stuff...

Dave

__________________
DaveRC is offline  
 
Reply With Quote Quick reply to this message
Old 01-31-2011, 02:57 PM   #7
DaveRC
 
Join Date: Dec 2010
Posts: 83
Liked 6 Times on 6 Posts

Default Re: Loctite, which one?

Hi,

Just can't find the Loctite 620 at any reasonable price, can find Loctite 648, which seems to have very similar properties, only major difference I can see is the temperature range, max temp on the 648 is 175C or 347F, is this high enough for valve guides on an air cooled 4 stroke...?

Dave

__________________
DaveRC is offline  
 
Reply With Quote Quick reply to this message
Old 01-31-2011, 03:39 PM   #8
QSPSB
 
Join Date: Jan 2010
Posts: 15
Liked 5 Times on 5 Posts

Default Re: Loctite, which one?

Here are a few links that may help you... I would purchase a decent size bottle of this stuff... I'm sure you will need more in the future...

http://cgi.ebay.com/LOCTITE-Retaining-Compound-Type-Size-Strength-Green-ALL-/360332890026?pt=LH_DefaultDomain_0&var=&hash=item9 2af7985f4
http://www.midwayusa.com/viewproduct/?productnumber=171860&cm_mmc=Froogle-_-Gunsmithing%20-%20Tools%2C%20Jigs%20%26%20Fixtures-_-PriceCompListing-_-171860
http://www.strobelssupply.com/Loctite?product_id=200623
http://www.strobelssupply.com/Loctite?product_id=200622
http://www.strobelssupply.com/Loctite?page=7

Stoney

__________________

http://www.youtube.com/user/QSPSB

QSPSB is offline  
 
Reply With Quote Quick reply to this message
Old 01-31-2011, 03:59 PM   #9
Metal Butcher
Project of the Month Winner!!!
 
Join Date: Dec 2008
Posts: 1,731
Liked 66 Times on 66 Posts

Default Re: Loctite, which one?

Quote:
Originally Posted by DaveRC
Hi,

Just can't find the Loctite 620 at any reasonable price, can find Loctite 648, which seems to have very similar properties, only major difference I can see is the temperature range, max temp on the 648 is 175C or 347F, is this high enough for valve guides on an air cooled 4 stroke...?

Dave
Its very pricey stuff that #620. You cold use the Permatex equivalent called 'Sleeve retainer'.

Here's another option if you would like to buy a smaller lower cost amount. You could get on the phone to check price and availability at your nearest auto parts stores that stock Permatex products.

http://www.google.com/products/catalog?hl=en&client=firefox-a&hs=b7c&rls=org.mozilla:en-USfficial&channel=s&biw=1675&bih=849&q=permatex+ high+temperature+sleeve+retainer&um=1&ie=UTF-8&cid=12944109630016817937&ei=CelGTbqDOcT48Abw7NDc AQ&sa=X&oi=product_catalog_result&ct=result&resnum =5&ved=0CDYQ8wIwBA#

-MB
__________________

In Constant Pursuit Of Perfection

Metal Butcher is offline  
 
Reply With Quote Quick reply to this message
Old 01-31-2011, 04:42 PM   #10
milotrain
 
Join Date: Jan 2011
Posts: 137
Liked 11 Times on 11 Posts

Default Re: Loctite, which one?

I would highly recommend getting Carroll Smith's book "Nuts, Bolts, Fasteners and Plumbing" as it's an interesting read about all fasteners but specifically he talks about a few of the Loctite verities and when/where to use them.

This is the google book result for the section on Loctite:
http://books.google.com/books?id=A81HmmRCN7YC&pg=PA129&lpg=PA129&dq=carrol l+smith+loctite&source=bl&ots=ZvrJAICFQz&sig=1MssJ Z4y3M5qAZNNVWwTD5RF45M&hl=en&ei=6fRGTe_NBo6ksQOHt5 WOCg&sa=X&oi=book_result&ct=result&resnum=1&ved=0C BsQ6AEwAA#v=onepage&q&f=false



__________________
milotrain is offline  
 
Reply With Quote Quick reply to this message
Reply


Quick Reply
Message:
Options

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
loctite speedyb The Break Room 9 01-30-2013 04:06 PM
Loctite or solder? Sshire Questions and Answers 3 12-16-2011 04:09 PM
Help with Loctite 640 ozzie46 Questions and Answers 15 03-19-2011 11:55 PM
Loctite 1hand Questions and Answers 13 01-27-2011 02:20 AM
What kind of Loctite to use? dicej32 Questions and Answers 1 03-13-2008 04:59 AM




- Top - Member List