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PV, 120 (Amazon), 1800 General Forum for the Volvo PV, 120 and 1800 cars |
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Valve Clearance Adjustment.Views : 7765 Replies : 20Users Viewing This Thread : |
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Jan 16th, 2009, 00:00 | #1 |
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Valve Clearance Adjustment.
Hello all. One of the next jobs I want to do on my B20 is check the valve clearances. I got a shiny new rocker cover and a new gasket so I guess now is the best time to be doing it. However the manuals are a bit vague on the subject. Has anyone got any advice or links to somewhere that has it in a bit more detail? Thanks, Hugh.
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1970 Volvo Amazon 131 with a B20A and an M40. |
Jan 16th, 2009, 05:41 | #2 |
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Last Online: May 21st, 2023 08:35
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Hi Hugh
Yup, here is a very comprehensive way to check and set the valve clearance. Clicky! I have just used it for my B18 and it works wonders! I truely recommend it. Bookmark vclassics.com, its really worth it for all the tech! Dylan Last edited by Dylan144GT; Jan 16th, 2009 at 05:45. |
Jan 16th, 2009, 11:09 | #3 |
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Location: Chorley
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The method using "exhaust just opening, then set inlet on same cylinder" and "inlet almost closed then set exhaust on same cylinder" advocated by Dylan's links works just as well as the time honoured "rule of nine" in the Haynes manual, except here is more room for error if you get it the wrong way round!
From a technical standpoint both put the cam on the base circle so the valve clearance should be at a maximum. I use the rule of 9 method on the Amazon but some engines can't use this if the ports are not symetrical about the midpoint of the engine. I use the valve opening/closing method on my bike because it's a V-twin, so there's no way of referring to the other cylinder. Rule of 9 (applies to B18, B20): Valve 1 rocker fully down, set valve 8, Valve 2 rocker fully down, set valve 7, and so on. The manual gives the order that the valves will open in. Just remember to write down the ones you have done so you don't miss any! |
Jan 16th, 2009, 21:06 | #4 |
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Thanks a million guys. Much appreciated Hugh.
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1970 Volvo Amazon 131 with a B20A and an M40. |
Jan 16th, 2009, 21:58 | #5 | |
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Quote:
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Jul 15th, 2019, 12:04 | #6 |
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Last Online: Dec 29th, 2022 11:47
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Location: Thorndon, near Eye, Suffolk, England
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Hi all, could someone give me a link where I can find the valve clearance data (1800E 1970). My poor old Haynes reprint is a bit vague!
Many thanks! |
Jul 15th, 2019, 12:11 | #7 |
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Last Online: Today 10:38
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Location: Chatham
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Google is your friend. It was quicker than pulling up the Green book on my hard drive.
"Injected B20s normally have the D cam, and the specs for that are .016 - .018 warm or cold. There is no problem going to the tight end of that spec." Quote from Phil Singher. |
Jul 15th, 2019, 12:14 | #8 | |
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Quote:
16 thousandths of an Inch and 18 thousandths of an inch ...
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My comments are only based on my opinions and vast experience . |
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Jul 15th, 2019, 18:02 | #9 |
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Thanks very much, both. Sorry for being such a div with the Google search!
Getting various different ideas, on order of adjustment. Are those measurements for hot or cold engine? |
Jul 15th, 2019, 18:37 | #10 |
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Last Online: May 8th, 2024 15:06
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Location: Alberta
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Do you have a Haynes manual? Lots of help there.
Same hot or cold. Valve clearance video https://m.youtube.com/watch?v=AVnnRSP2NCo Try a google search, or search this forum before asking a question. Even if you don’t find your answer, you’ll learn something from your reading. Cheers. |
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