 Valve train wear-in, How long for new valve train to wear-in. |
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| pistonboy |
 Jan 15 2023, 01:39 AM
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#1
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Newbie  Group: Members Posts: 38 Joined: 26-October 15 From: California Member No.: 19,305 Region Association: None  |
Hello
Please consider the following engine. The engine has been rebuilt with a complete new valve train. This includes new: cam, lifters, pushrods, valves, valve seats, guides, and springs. My question is: How many miles does it take to wear-in the new valve train ? Thank you. |
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| Superhawk996 |
Jan 15 2023, 07:14 AM
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#2
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914 Guru Group: Members Posts: 5,815 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch 
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Cam and lifter break in happens in about the first 20 minutes of running.
The rest of the components like valves and valve seats will get to know each other better in a couple hundred miles. |
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| Robarabian |
Jan 15 2023, 10:32 AM
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#3
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914 A Roo Group: Members Posts: 591 Joined: 11-February 19 From: Simi Valley, Kalifornia Member No.: 22,865 Region Association: Southern California
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Usually, you do the following to initially seat rings and break in the valve train:
1 Break in oil 2) Crank but don't fire and make sure you have oil pressure building. 3)Start it and bring it up to about 2K RPM's (Time it if possible or get it close) 4) Hold that position for about 20 minutes.... 5) Monitor oil pressure during the entire event and watch for leaks, smokes, noises etc.... Shut it down and let it cool. Once you are through that, you an break in as normal. |
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| brant |
Jan 15 2023, 01:06 PM
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#4
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914 Wizard Group: Members Posts: 11,623 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains 
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QUOTE(Robarabian @ Jan 15 2023, 09:32 AM)  Usually, you do the following to initially seat rings and break in the valve train: 1 Break in oil 2) Crank but don't fire and make sure you have oil pressure building. 3)Start it and bring it up to about 2K RPM's (Time it if possible or get it close) 4) Hold that position for about 20 minutes.... 5) Monitor oil pressure during the entire event and watch for leaks, smokes, noises etc.... Shut it down and let it cool. Once you are through that, you an break in as normal. I agree with this But add to change the oil after that initial 20 minutes Then more break in oil after checking the valves. Another oil change after a few hundred miles |
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| Robarabian |
Jan 15 2023, 01:46 PM
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#5
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914 A Roo Group: Members Posts: 591 Joined: 11-February 19 From: Simi Valley, Kalifornia Member No.: 22,865 Region Association: Southern California
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DUH, I forgot to put that.. yes, immediate oil change to get the metal out... thanks for catching that!I would do 500 miles easy and then change it to the normal oil. That's just me.
QUOTE(brant @ Jan 15 2023, 11:06 AM) QUOTE(Robarabian @ Jan 15 2023, 09:32 AM) Usually, you do the following to initially seat rings and break in the valve train: 1 Break in oil 2) Crank but don't fire and make sure you have oil pressure building. 3)Start it and bring it up to about 2K RPM's (Time it if possible or get it close) 4) Hold that position for about 20 minutes.... 5) Monitor oil pressure during the entire event and watch for leaks, smokes, noises etc.... Shut it down and let it cool. Once you are through that, you an break in as normal. I agree with this But add to change the oil after that initial 20 minutes Then more break in oil after checking the valves. Another oil change after a few hundred miles |
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| bkrantz |
Jan 15 2023, 09:03 PM
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#6
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914 Guru Group: Members Posts: 7,761 Joined: 3-August 19 From: SW Colorado Member No.: 23,343 Region Association: Rocky Mountains
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And for break-in oil, get something with high zinc content. Or get a zinc additive.
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| 76-914 |
Jan 15 2023, 09:16 PM
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#7
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Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,500 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California
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And don't stop the engine during that 20 minute break-in period. (IMG:style_emoticons/default/beerchug.gif)
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