Pagoda SL Group

W113 Pagoda SL Group => Drive train, fuel, suspension, steering & brakes => Topic started by: Miloslav Maun on July 13, 2009, 16:24:56

Title: Injection pump oil valve
Post by: Miloslav Maun on July 13, 2009, 16:24:56

What is the function of the pressure valve on the back of the injection pump? I cannot blow through it any direction. Is that normal?

Thanks.

BTW: The car is a 230 SL with the pump that has its own oil dipstick.

Title: Re: Injection pump oil valve
Post by: Benz Dr. on July 13, 2009, 20:11:42

That thing is a one way check valve. It lets oil into the pump to lube the elements but won't let oil mixed with gas go back into the oil galley.
Normally the engine will have enough oil pressure at idle to hold a constant pressure and keep oil pressure around the valve elements. If the pressure drops very low the valve will close preventing fuel from backing up into the engine oil.

 There's a cone shaped valve similar to what's used in the CSV with a small spring behind it. If this gets stuck or seized no oil will flow into the pump and it will seize too or damage the injection elements. You can take the check valve apart and clean it. You should be able to push the valve open with very little force. I think it's less than 10 PSI.

Title: Re: Injection pump oil valve
Post by: Miloslav Maun on July 14, 2009, 20:48:35

Thanks. Fixed.   :)

Title: Re: Injection pump oil valve
Post by: Benz Dr. on July 15, 2009, 01:02:26

That's good. It's something that HAS to work right or the pump will be ruined.

Title: Re: Injection pump oil valve
Post by: Naj ✝︎ on July 15, 2009, 06:46:15

Quote from: Muf on July 14, 2009, 20:48:35

Thanks. Fixed.   :)

Muf,

Did you take any pictures?

naj