Perkin 4-107 surges

Running at 1500 RPM the engine will surge 500 to 1000 RPM after 10 - 15 min run time. The the frequency increses to 1 - 2 minutes and the surge increases to 1000- 2000 RPM. Boat speed increases when this occurs. The RPM rackets up and will not throttle down. It remains at the higher RPM when shifted to neutral. I then shut engine down and after 5 minutes restart to normal idle RPM, about 500. Then the surge build up begins again. Any ideas appreciated. Thanks Mike Robinson S/V Eleanor May (916) 705-3200 our blog: http://www.sailblogs.com/member/eleanormay/

First thing I think would be to change all fuel filters, make sure you don't have any air leaks in the fuel system and bleed it all the way through. Sounds fuel delivery-ish to me. On Saturday, September 7, 2019, 12:05:37 PM PDT, Michael Robinson mi… [at] hotmail.com [Cal_Boats] <Ca… [at] yahoogroups.com> wrote: Running at 1500 RPM the engine will surge 500 to 1000 RPM after 10 - 15 min run time. The the frequency increses to 1 - 2 minutes and the surge increases to 1000- 2000 RPM. Boat speed increases when this occurs. The RPM rackets up and will not throttle down. It remains at the higher RPM when shifted to neutral. I then shut engine down and after 5 minutes restart to normal idle RPM, about 500. Then the surge build up begins again. Any ideas appreciated. Thanks Mike RobinsonS/V Eleanor May(916) 705-3200 our blog:http://www.sailblogs.com/member/eleanormay/

When have you had your injectors and high pressure pump tested & calibrated? Mr. Perkins suggests each 1,000 hours. Next time you are in Pensacola, FL bring the injectors over to my shop and I will test them while you watch. I do not have the $20,000 machine for testing/calibrating high pressure pumps. We send our to Atmore Fuel Injection in Atmore, AL. If you remove your pump, be sure to index it. Contact me if you want their address. There are several wear points in the pump that could cause surging. Tom Vandiver, Cal 46 SATORI w/Perkins 4.236 On Saturday, September 7, 2019, 2:10:59 PM CDT, Kris Jensen cr… [at] att.net [Cal_Boats] <Ca… [at] yahoogroups.com> wrote: First thing I think would be to change all fuel filters, make sure you don't have any air leaks in the fuel system and bleed it all the way through. Sounds fuel delivery-ish to me. On Saturday, September 7, 2019, 12:05:37 PM PDT, Michael Robinson mi… [at] hotmail.com [Cal_Boats] <Ca… [at] yahoogroups.com> wrote: Running at 1500 RPM the engine will surge 500 to 1000 RPM after 10 - 15 min run time. The the frequency increses to 1 - 2 minutes and the surge increases to 1000- 2000 RPM. Boat speed increases when this occurs. The RPM rackets up and will not throttle down. It remains at the higher RPM when shifted to neutral. I then shut engine down and after 5 minutes restart to normal idle RPM, about 500. Then the surge build up begins again. Any ideas appreciated. Thanks Mike RobinsonS/V Eleanor May(916) 705-3200 our blog:http://www.sailblogs.com/member/eleanormay/

Thanks Tom! Mike Robinson S/V Eleanor May (916) 705-3200 our blog: http://www.sailblogs.com/member/eleanormay/ From: Ca… [at] yahoogroups.com <Ca… [at] yahoogroups.com> on behalf of Yahoo Mail bs… [at] yahoo.com [Cal_Boats] <Ca… [at] yahoogroups.com> Sent: Saturday, September 7, 2019 11:28 PM To: Michael Robinson mi… [at] hotmail.com [Cal_Boats] <Ca… [at] yahoogroups.com>; Kris Jensen <cr… [at] att.net> Subject: Re: [Cal_Boats] Perkin 4-107 surges When have you had your injectors and high pressure pump tested & calibrated? Mr. Perkins suggests each 1,000 hours. Next time you are in Pensacola, FL bring the injectors over to my shop and I will test them while you watch. I do not have the $20,000 machine for testing/calibrating high pressure pumps. We send our to Atmore Fuel Injection in Atmore, AL. If you remove your pump, be sure to index it. Contact me if you want their address. There are several wear points in the pump that could cause surging. Tom Vandiver, Cal 46 SATORI w/Perkins 4.236 On Saturday, September 7, 2019, 2:10:59 PM CDT, Kris Jensen cr… [at] att.net [Cal_Boats] <Ca… [at] yahoogroups.com> wrote: First thing I think would be to change all fuel filters, make sure you don't have any air leaks in the fuel system and bleed it all the way through. Sounds fuel delivery-ish to me. On Saturday, September 7, 2019, 12:05:37 PM PDT, Michael Robinson mi… [at] hotmail.com [Cal_Boats] <Ca… [at] yahoogroups.com> wrote: Running at 1500 RPM the engine will surge 500 to 1000 RPM after 10 - 15 min run time. The the frequency increses to 1 - 2 minutes and the surge increases to 1000- 2000 RPM. Boat speed increases when this occurs. The RPM rackets up and will not throttle down. It remains at the higher RPM when shifted to neutral. I then shut engine down and after 5 minutes restart to normal idle RPM, about 500. Then the surge build up begins again. Any ideas appreciated. Thanks Mike Robinson S/V Eleanor May (916) 705-3200 our blog: http://www.sailblogs.com/member/eleanormay/

Thanks Kris Mike Robinson S/V Eleanor May (916) 705-3200 our blog: http://www.sailblogs.com/member/eleanormay/