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  1. #1
    neil1967 is offline Registered User
    Location : Netherlands, boats in Portsmouth & Fethiye
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    Default How to check diesel RPM?

    My Perkins 4108 idles very lumpily at an indicated 900RPM, but in all other respects is fine - no smoke or oil or water consumption, and it revs well. Before I investigate further I would like to check the actual engine idle speed - it may just be that the engine is idling to slowly. So what is the best way to check the rpm, without using the permanent rev counter? I have a Gunson strobe for the car, but that only works on petrol engines, as it takes timing off the spare plug lead.

    Thanks

    Neil

  2. #2
    Join Date
    Jun 2001
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    Quote Originally Posted by neil1967 View Post
    My Perkins 4108 idles very lumpily at an indicated 900RPM, but in all other respects is fine - no smoke or oil or water consumption, and it revs well. Before I investigate further I would like to check the actual engine idle speed - it may just be that the engine is idling to slowly. So what is the best way to check the rpm, without using the permanent rev counter? I have a Gunson strobe for the car, but that only works on petrol engines, as it takes timing off the spare plug lead.

    Thanks

    Neil
    Lumpy running can be caused by a poor injector and exacerbated by a sloppy governor. Maybe get the injectors serviced at a diesel shop and if the lumpy running is not not cured then get the fuel pump serviced as the governor is inside it.
    Eastern Scotland and beyond.

  3. #3
    PCUK is offline Registered User
    Location : Mid Devon
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    You need to borrow a strobe tester.

  4. #4
    Puggy's Avatar
    Puggy is offline Registered User
    Location : Hampshire, UK
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    Search eBay for RPM meter, very inexpensive: I bought one to check my rev counter and works a treat.

  5. #5
    nigelmercier's Avatar
    nigelmercier is offline Registered User
    Location : Live in Kent, boat in Canary Islands
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    Quote Originally Posted by Puggy View Post
    Search eBay for RPM meter, very inexpensive: I bought one to check my rev counter and works a treat.
    Or on Amazon: http://www.amazon.co.uk/exec/obidos/...H0/dolcetto-21
    ⓒ Nigel Mercier 2014
    FREE Bavaria Yacht Forum: www.bavariayacht.info

  6. #6
    Join Date
    May 2013
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    You need a hand held tachometer. They come as either a contactless type that uses lasers or contact type where they have a wheel that you press against the crank pulley. Go for the laser type as your far less likely to lose all you fingers in a drive belt. ( I know someone who this happened too).

  7. #7
    neil1967 is offline Registered User
    Location : Netherlands, boats in Portsmouth & Fethiye
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    Thanks all. I am going to get the injectors serviced this winter and will bear the governer in mind. I had no idea that laser/LED tachos were so cheap!

    Neil

  8. #8
    Piers's Avatar
    Piers is offline Registered User
    Location : Guernsey, Channel Islands
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    I bought one and calibrated the tachies on Play d'eau. Two people required. One to control the throttle, note down the tachy and strobe readings, whilst the other manages the strobe.

    Simples.
    These are the voyages of Play d'eau....www.playdeau.com

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