[MBZ] OM617/300sd oil pressure drop at idle, in gear
This is related to my run-hot thread I seem to recall that the (base) MB spec for oil pressure at hot idle in an OM617 is 1 bar. I am getting ~1.5-ish bar at idle hot in park, even when the car is running hot, but it drops further and faster, to 1 bar in gear once the engine has really got hot, or I'm in dead traffic, and can even sneak just under the 1 bar mark in traffic jams. So I am constantly shifting into neutral when waiting. Question: what is the spec, and is it spec'd for neutral/park or idling in gear? TKS -- Mac Steve MacSween Aylmer, Quebec (Canada) Mercedes: '82 300sd / '82 240d (x2) / '60 220s Volvo: '87 245 (waiting for OM616 transplant) SAAB: '83 900T (waiting for a miracle)
Re: [MBZ] OM617/300sd oil pressure drop at idle, in gear
What weight oil are you running? Some say spec is .5. I was using 0/40 M1 and saw the same conditions you describe. Changed to 15/50 M1 and now never goes below 1 bar now even at 110 degrees, idling in traffic with A/C on. On 5/27/06, Steve MacSween [EMAIL PROTECTED] wrote: This is related to my run-hot thread I seem to recall that the (base) MB spec for oil pressure at hot idle in an OM617 is 1 bar. I am getting ~1.5-ish bar at idle hot in park, even when the car is running hot, but it drops further and faster, to 1 bar in gear once the engine has really got hot, or I'm in dead traffic, and can even sneak just under the 1 bar mark in traffic jams. So I am constantly shifting into neutral when waiting. Question: what is the spec, and is it spec'd for neutral/park or idling in gear? TKS -- Mac Steve MacSween Aylmer, Quebec (Canada) Mercedes: '82 300sd / '82 240d (x2) / '60 220s Volvo: '87 245 (waiting for OM616 transplant) SAAB: '83 900T (waiting for a miracle) ___ http://www.striplin.net For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://striplin.net/mailman/listinfo/mercedes_striplin.net -- John Freer Palm Springs, CA 1992 500 SEL 143K Stardust 1985 380SL 143K Blue Belle 1996 Sidekick 57K Kermit
Re: [MBZ] OM617/300sd oil pressure drop at idle, in gear
Steve MacSween wrote: This is related to my run-hot thread I seem to recall that the (base) MB spec for oil pressure at hot idle in an OM617 is 1 bar. I am getting ~1.5-ish bar at idle hot in park, even when the car is running hot, but it drops further and faster, to 1 bar in gear once the engine has really got hot, or I'm in dead traffic, and can even sneak just under the 1 bar mark in traffic jams. So I am constantly shifting into neutral when waiting. Question: what is the spec, and is it spec'd for neutral/park or idling in gear? As long as the idle is above 0.5 at idle (0.3 in later cars) there is NO problem. The oil pressure must increase to 3 bar as the car comes up to speed (Mercedes doesn't absolutely require it to reach 3 bar until 3000 rpm, but I get nervous if it's not there by 2000). Of importance is that idle be at 700-800 under ALL conditions (AC on, AC off, in gear, out of gear, etc.). If it won't do that, there is something (usually minor) wrong. Marshall -- Marshall Booth (who doesn't respond to unsigned questions) der Dieseling Doktor [EMAIL PROTECTED] '87 300TD 182Kmi, '85 190D 2.0 161Kmi, '87 190D 2.5 turbo 237kmi, '84 190D 2.2 229Kmi (retired)
Re: [MBZ] OM617/300sd oil pressure drop at idle, in gear
on 5/27/06 2:16 PM, Marshall Booth at [EMAIL PROTECTED] wrote: Of importance is that idle be at 700-800 under ALL conditions (AC on, AC off, in gear, out of gear, etc.). If it won't do that, there is something (usually minor) wrong. Oh, dear, here we go again ;-) My idle jumps up (estimating, dead tach) about 150-200 rpms in neutral, more so when the engine is fully warmed up. I always thought that was just normal. My w116 SD did it too, IRRC, can't remember what my ex-Kaleb SD did. TKS -- Mac Steve MacSween Aylmer, Quebec (Canada) Mercedes: '82 300sd / '82 240d (x2) / '60 220s Volvo: '87 245 (waiting for OM616 transplant) SAAB: '83 900T (waiting for a miracle)
Re: [MBZ] OM617/300sd oil pressure drop at idle, in gear
Steve MacSween wrote: on 5/27/06 2:16 PM, Marshall Booth at [EMAIL PROTECTED] wrote: Of importance is that idle be at 700-800 under ALL conditions (AC on, AC off, in gear, out of gear, etc.). If it won't do that, there is something (usually minor) wrong. Oh, dear, here we go again ;-) My idle jumps up (estimating, dead tach) about 150-200 rpms in neutral, more so when the engine is fully warmed up. I always thought that was just normal. My w116 SD did it too, IRRC, can't remember what my ex-Kaleb SD did. TKS The device in the injection pump that controls fuel quantity responds to engine rpm. If it won't hold engine speed relatively constant (once the engine temp has stabilized) it isn't working as it was intended to work. Marshall -- Marshall Booth (who doesn't respond to unsigned questions) der Dieseling Doktor [EMAIL PROTECTED] '87 300TD 182Kmi, '85 190D 2.0 161Kmi, '87 190D 2.5 turbo 237kmi, '84 190D 2.2 229Kmi (retired)
