 Lets Talk About Lapping Cylinders, Have I got this right? |
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| DuckRyder |
  Dec 23 2003, 10:08 AM
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#1
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Avatars Mode: OFF because of the recalcitrant few.  Group: Benefactors Posts: 767 Joined: 8-January 03 From: Georgia Member No.: 110   |
So, we leave out the "head gaskets" and lap the cylinders into the head?
1) I assume we are using valve-grinding compound. 2) I am going to insert each cylinder into the head where I am going to install it. 3) I spin said cylinder until I see a nice shiny ring on the head and rim of the cylinder. Have I got that right? |
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Replies(1 - 6)
| Brad Roberts |
Dec 23 2003, 10:36 AM
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#2
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914 Freak! Group: Members Posts: 19,148 Joined: 23-December 02 Member No.: 8 Region Association: None |
I dont know how shiny it will be... but you have everything else correct.
B |
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| thesey914 |
Dec 23 2003, 10:39 AM
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#3
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Senior Member Group: Benefactors Posts: 1,155 Joined: 1-January 03 From: Staffordshire -England Member No.: 66 |
Maybe not just spin...but in a back and forward motion (IMG:style_emoticons/default/rolleyes.gif)
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| Tom Perso |
Dec 23 2003, 10:40 AM
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#4
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Crazy from the Cold... Group: Members Posts: 647 Joined: 8-August 03 From: Kalamazoo, MI Member No.: 1,003 |
The ring should be a dark color, full coverage around the outside ring of the head register.
Mark them and assemble the works. Tom |
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| DuckRyder |
Dec 23 2003, 04:13 PM
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#5
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Avatars Mode: OFF because of the recalcitrant few. Group: Benefactors Posts: 767 Joined: 8-January 03 From: Georgia Member No.: 110 |
O.K. Spent the day putting the bottom end together.
That went without any real incident. SO tomorrow is cylinder lapping day. Pray for me..................... |
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| Jake Raby |
Dec 23 2003, 05:34 PM
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#6
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
Use a piece of thick glass with 400 grit sandpaper to true the mating surfaces of the cylinderbefore you start.
Take Dykem machinist dye and coat the top of each cylinder. work with the 400 with the cylinder flat till the dykem is gone and the cylinder is as close to flat as possible. Then use clover lapping compound to match each cylinder into the respectful register....... Lap till the thin gray ine is as wide as the cylnder. CLEAN EVERYTHING SUPER WELL! Then coat the head surface with Permatex Copper coat. This will give a gooey compound and it will help create a carbon seal when the engine fires up. This way the engine seals its self!! When the heads are torqued up use compressed air in the cylinder and use a match or lighter to look for leaks. They can be seen easily with the flicker of the flame.. |
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| kdfoust |
Dec 23 2003, 06:33 PM
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#7
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Senior Member Group: Members Posts: 694 Joined: 2-January 03 From: Riverside Member No.: 71 Region Association: Southern California |
Duck: when lapping use a figure-8 motion.
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