| Author |
Message |
Nick Morris (Nick3751)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, November 21, 2005 - 7:09 pm: | |
I put the recomended oil in the ol' gal to day after putting an electric pump on to check for leaks. I couldn't even get anything out of the return much less get a leak. I changed the oil anyhow and struck out for a little trip. I'm still not tickled with the drop from start to stop but it's not as much as with the 15W-40 I was using nor is the oil as black or as thin (obviously) on the dip stick.
How much pressure do your coaches lose between a 55 degree start up and the end of a ten mile trip. I started at 40 psi at start up, by the time I got the engine compartment buttoned up and all the bays shut I was down to about 30-35 at idle. When I got back from my little excersion I was down to about 20-25. That beats the previous by about 8-10. Considering DA BOOK says I should run 3-5 at idle and 10-20 at speed I think I'm ok but the rig my folks had (a year newer but other wise the same) ran about 80 at speed (about 85-90 mph)I'm not sure. On the other hand that rig started blowing oil out above 55mph.
If someone is near Valdosta GA that could help with this thing I'd really appreciate it. I'm a fair parts changer but I've never delt with a two cycle diesel. |
Dale L. Waller (Happycampersrus)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, November 21, 2005 - 7:27 pm: | |
Nick,
Are you saying you have 20-25 psi at idle after a run??If so you are doing fine.
When you said recommened oil, is it 40wt. Delo or equivalent??
80 psi is a little on the high side. These Detroits are not designed to run that much oil pressure. out of the 2 strokes I can't think of any that should be out of the normal 50-70 range at 2100rpm.
Dale |
Nick Morris (Nick3751)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, November 21, 2005 - 8:02 pm: | |
Thats the oil 40wt delo CF2. I thought you guys were full of it. I didn't know there was that much difference in oil.
I'm running 20-25 at idle and 30-35 at speed at the end of my little trip. |
John Feld (Deacon)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, November 21, 2005 - 8:36 pm: | |
Nick,
Your bottom is great but the high side is a little low, check it again after a good 500 miles or so of hard driving. You may have some cakeing that needs to be cleaned out under preasure.
John F. |
gusc
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, November 21, 2005 - 9:44 pm: | |
Nick,
I run 30W in my 4104 and get about 50psi at speed when cold and 40 when warm if it is at least halfway between the LOW and FULL mark. The closer it gets to the LOW mark the lower it goes until about 32 at LOW. This is the way I know when to add oil.
This is driving all day in medium warm weather across the western US in Sept.
I don't notice what it is at idle but I think it is around 10.
I agree that 80 is much too high. Your high of 35 is maybe a bit low with 40W if the oil level is 1/2 or higher above LOW but as long as mine doesn't go lower than 30-35 I don't worry about it. |
Tim Hoskinson (Tdh37514151)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, November 21, 2005 - 10:31 pm: | |
Hey Nick I don't think your oil pressure is all that bad. As others here have stated the high rpm pressure is a little low but that can be caused by things other than worn bearings. When you drove to Georgia you had told me that you were getting a good bit of smoke even after the engine was warm did you get that problem straitened up? |
FAST FRED
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, November 22, 2005 - 5:48 am: | |
Most bypass springs on a 6-71 oil pump will limit the pressure to about 45psi.
Might be worth the price for a new spring & ball.
FAST FRED |
Nick Morris (Nick3751)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, November 22, 2005 - 8:48 am: | |
It smokes at start up like one of those bradleys laying a smoke screen and pure white. After it runs about a minute or so it quits loping and has just a touch of kina light blue smoke, but after I drive enough to get the temp gauge to move there's very little smoke; unless it black when I stomp on it.
I'm going to take about a hundred mile trip or so today and see how things turn out. |
Nick Morris (Nick3751)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, November 22, 2005 - 12:54 pm: | |
Well I guess if you guys thought I was a little low before your not going to like this at all. After about 75-80 miles she's holding about 20-21 at speed. She started at about 35 and after about 10 miles was down to around 20 and stayed there up the interstate and back down the secondary roads through town and back to the house. It drops to five to ten at idle depending on where it wants to idle.
I'm guessing that low a pressure is telling me I need a rebuild. I talked to the NAPA guy on the way back through town to get a price on a kit, he's gunna give me a call later. If I'm gunna do it I figure I'm gunna pull it and have the head done and all the machining done all at once. Anybody got a good four valve head that will fit? |
ned sanders (Uncle_ned)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, November 22, 2005 - 2:09 pm: | |
nick
first thing is see a good old time detroit man.my old o4 number 172. had a cracked head but still made two trips from carolina to daytona pulling a 20 ft motorcycle trailer. just had to add water and change the oil reg.replaced the head and the bearings.runs better than ever.
it is more fun to drive than my other 04 with 6v92 and v730.
ned
ps i am in western nc go to georgis to dirt bike races |
FAST FRED
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, November 22, 2005 - 3:29 pm: | |
Not a rebuild , just a new set of rod & main bearings.
Couple of days work & couple of hundred bucks.
Before a complete rebuild is chosen , you might consider a compression test , and a blow by test.
FAST FRED |
Nick Morris (Nick3751)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, November 22, 2005 - 3:35 pm: | |
I've also got a lot of oil comming out of the vent on the top of the valve cover. A lot as in it was dripping off the engine after my little trip. I figure that's due to blow by over pressureizing the block. |
John MC9
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, November 22, 2005 - 8:13 pm: | |
"It smokes at start up like one of those bradleys laying a smoke
screen and pure white. After it runs about a minute or so it
quits loping and has just a touch of kina light blue smoke, but
after I drive enough to get the temp gauge to move there's very
little smoke; unless it black when I stomp on it. "
Sounds like it's head gasket time, if it all clears up after it's
hot. Low oil pressure can be caused by a too dense oil filter
also. I'd be more concerned about that white and blue smoke,
if I were you. |
Nick Morris (Nick3751)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, November 22, 2005 - 9:52 pm: | |
Just put a new head gasket on last fall when I did the muffler. No change in the smoke or the pressure. |
Dale L. Waller (Happycampersrus)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, November 22, 2005 - 11:37 pm: | |
Hey Nick,
First thing we would do is pull a compression check. That is going tell you alot about the condition of your engine.
Next is check your blow by, The way WE do the 2 stroke detroits is with a compression tester and shop air. Remove the airbox covers, cycle the piston until the rings are above the liner ports, then apply air and listen. There will be some blow by even in a healthy engine, but alot is bad.
That is something that I have learned to judge on my own. Everyone will have a different opinion of too much blow by, But broke rings show up quick.
Then if you can turn the engine and inspect each piston & cylinder. With an inspection mirror you should be able to see alot of the rings and piston. Bore scope is helpful also.
If that checks good, Drop the oil pan and inspect the rods and main bearings. I would change em out while I was there if the compression and blow by checks out ok.
Also you will want to check out your blower seals to see if you have oil blow by and oil sucked into the engine.
Does this engine make good power???
Dale |
John MC9
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, November 23, 2005 - 12:58 am: | |
Re:
"Just put a new head gasket on last fall "
I'd do it again. Re-torque to specs, and re-torque
again after running it. See if you have oil in water or water
in oil, or pressure in water tank.
It sounds like a head gasket |
David Dulmage (Daved)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, November 24, 2005 - 1:43 pm: | |
Electric sending unit/gauge combinations may read low. If you have a mechanical oil pressure gauge in the engine compartment, check it with the engine idling or at fast idle and compare it with the reading on the dash gauge to establish a reference. You may find that a reading on the mechanical gauge of 20 psi might show up as only 10 psi on the electrical gauge. I would tend to rely on the mechanical gauge as being closer to the actual pressure.
FWIW
Dave Dulmage
(MC-8) |
rstrick182
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, December 04, 2005 - 12:37 pm: | |
Wow, I live in Valdosta, GA, but doubt I could be of much help. Just thought it was neat that someone else was in Valdosta. Are you the guy with the MCI that lives off of White Water Road?? |
Nick Morris (Nick3751)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, December 05, 2005 - 1:15 pm: | |
Nope I've got a 3751 I'm actually in Ray City. |