|
|
|
#1
|
||||
|
||||
Pre-glow cycle spin-over
If my car has been sitting for a while, sometimes I like to turn my engine over for a couple seconds before the glow plugs get a chance to heat up (turns over, but won't start), Then I let the glow plugs do a full cycle and start it. Seems to help the oil pressure build a little quicker when the engine begins to run. I know it's more work for the battery, glow plug system, and starter- but does doing this reduce any engine wear (at startup)?
__________________
1985 300TD 1981 Scirocco 1.6D conv 1986 Golf 1.6D 2003 Golf TDI |
#2
|
|||
|
|||
I do that sometimes when the car has not been started for a week or more. I have replaced the o-rings on the shaft that goes through the oil filter. The oil pressure came up quicker for a while. Seems like all too soon the delayed oil pressure problem returned.\
I'd say if we bought an ample supply of those o-rings and changed them with each oil change our delayed oil pressure would cease. Does anyone know if the nitrate o-rings sold by Harbor Freight are suitable for this application?
__________________
84 300SD 85 380SE 83 528e 95 318ic |
#3
|
||||
|
||||
There is a purple/Voilet wire that goes from the Glow Plug Relay to your Starting Circuit. So, your Glow Plugs are actually on during cranking.
One of the reasons that Starting Fluid should not be used as the Glow Plugs will ignite it early on. On the Turbo Models you can see a White and Purple wire on the Terminal box. The White Wire comes up from the Starter Solenoid and gets Voltage when the Engine is Cranking; that gives the Purple Wire Voltage and activates your Glow Plug Relay.
__________________
84 300D, 82 Volvo 244Gl Diesel |
#4
|
||||
|
||||
Pre-start
Quote:
I've read (don't know if it's true) that very large engines have starting systems that bring the oil pressure up before the engine starts. This may be related to the difficulty and expense of overhauling these large engines. Since Mercedes diesel engines last hundreds of thousands of miles without such systems, they must not be necessary. We would be better off spending our time and dollars keeping the oil in our engines clean through frequent oil and filter changes. Although much less exciting than special starting systems, oil changes are the single most effective way to promote engine longevity. Jeremy
__________________
"Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970 |
#5
|
||||
|
||||
Quote:
I didn't replace the little o-rings at last oil change and there is a little more delay in oil pressure at startup. I think your right, change 'em every time. There really should be a filter that includes those o-rings. ?
__________________
1985 300TD 1981 Scirocco 1.6D conv 1986 Golf 1.6D 2003 Golf TDI |
#6
|
||||
|
||||
Quote:
__________________
85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked |
#7
|
||||
|
||||
Quote:
You can verify it for yourself by looking up the Wiring Diagram or if you have a Turbo Diesel; or, locate the Junction/Terminal Box in front of the Battery. On the Rigt side of the Pic is a White Wire (that comes up from the starter Solenoid) and the Purple/Voilet wire under it. Remove the Screw there and touch the Purple/Voilet Wire to any of the 2 Terminals to the left (they have + voltage) and you will here your Glow Plug Relay click on. You will also note the Purple/Violet Wire at the Glow Plug Relay connection. Also note that this is the same place a Remote Starter Switch can be hooked up to (the yellow arrows). On other non-turbo Diesel 123 models the Purple/Violet Wire is connected at the Starter Solenoid.
__________________
84 300D, 82 Volvo 244Gl Diesel |
#8
|
||||
|
||||
Quote:
Comment from one article I found: "This is an important attribute since most of the engine wear occurs during the start-up, primarily due to lubricant starvation." Chapter 5: Combustion Engine Lubricants The longer a Engine sits not being used the more time the Oil has to drain out of the Bearings and create that "Lubricant Starvation" the article mentions. You notice that UPS and the like delivery Vehicles leave the Engines running. That reduces Engine wear from starting and also wear on the Starter.
__________________
84 300D, 82 Volvo 244Gl Diesel |
#9
|
||||
|
||||
Quote:
Looking at a wiring diagram tells you nothing as to how the glow plug relay operates in regards to the purple wire.
__________________
85 300D turbo pristine w 157k when purchased 161K now 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked |
#10
|
||||
|
||||
Quote:
Seeing the Wiring diagram is what made me wan to test it.
__________________
84 300D, 82 Volvo 244Gl Diesel |
#11
|
||||
|
||||
You're spending more on new ignition tumbler/switch, starter, battery, and glow plugs than you will save by reducing any engine wear. If you use a good synthetic oil it will stick to metal parts in the engine and protect them better during long sits between starts.
__________________
-diesel is not just a fuel, its a way of life- '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k) |
#12
|
|||
|
|||
Perfectly sure.
Tested and confirmed by several members on here. |
#13
|
|||
|
|||
Quote:
The purple wire is hot in the "start" position. The wire goes "cold" when the key is released from the "start" position; that signals "start complete" to the timer, which terminates the glow cycle. In the absence of the hot/cold sequence, the timer "times out" as if no start was attempted. (Not applicable to afterglow systems.)
__________________
When cryptography is outlawed, bayl bhgynjf jvyy unir cevinpl. |
#14
|
||||
|
||||
On mine the the glow light goes out as soon as the key goes to START position. I assume the glow plugs are instantly bypassed because the engine just spins over without starting, if I do it quickly.
A remote starter would be a much better way to go- A good remote starter is always really cool, Great Info! Thanks
__________________
1985 300TD 1981 Scirocco 1.6D conv 1986 Golf 1.6D 2003 Golf TDI |
#15
|
|||
|
|||
Quote:
The glow plugs are energized during "start". If you wait sufficient time in "start", the plugs will build sufficient heat to enable combustion. |
Bookmarks |
|
|