Oil Problem

xupkid2 · 04-03-2007, 06:44 PM

I just rebuilt my motor this past winter. New rings, seals, bearings and all the goods. I am now having a problem. My oil dip stick is popping out while running. There also seems to be oil coming out from near the air intake, what I believe is the crank case breather. Im thinking it could be 1 of 2 things. Either the rings are not seated and it is forcing pressure into the crankcase or the crank case breather is clogged. The first question I have is how do I check for clogged crank case breather. Secondly how can I get my rings to seat properly. Three any other potential problems you can think of based on the symptoms I described.

Overall my oil pressure is excellent, always near 5. I just had a 3 day track event with no problems and the motor ran real well.

Thanks for the help.

hpaulb · 04-04-2007, 05:54 AM

Compresion test should tell the story. Try a leak down as well just in case you have a valve stem seal popped off.

SoCal Driver · SoCal Driver's Garage

If you honed the cylinders before installing the new rings you did it wrong. Cylinders have to be etched -- aluminum chemically cut back to expose the silicon -- after being honed. Otherwise your rings will not seat.

xupkid2 · 04-04-2007, 09:44 AM

Nope I learned the lesson about honing them the first time I rebuilt the engine. This time I left them alone and did not touch them. Im planning on compression and leak down testing the engine this weekend so I suppose we will see what that reveals. If that checks out ok then I assume its the crank case breather and that I should just replace the breather hoses and such?

SoCal Driver · SoCal Driver's Garage

This is the second time you have rebuilt the same engine? Why?

xupkid2 · 04-04-2007, 10:27 AM

The first time I built it was because it has a #2 rod journal bearing failure. When I rebuilt the engine I honed the cylinder so once I found out that was wrong I bought a new block and built it again. NOw on the new engine I am having the crank case pressure problem so Im trying to diagnose that. The motor ran extremely well for 3 full track days so now Im just working out the bugs.

Razorback1980 · Razorback1980's Garage

This is a just a long shot, but I was just wondering if the backpressure could push back into the intake and the crankcase through the oil air separator. What does your exhaust look like? Any smoke or possibly lack of air coming through the exhaust.

xupkid2 · 04-10-2007, 07:31 AM

Well I have done some testing and tearing apart of things. I took apart the breather hoses and did not find any clogs so it appears the breather system is ok. I did find a small amount of oil in my throttle body hose/boot. Not much at all in the intake but I cleaned it anyways.

I also did a compression test and each cylinder was within 5% of eachother at around 170 according to my compression tester.

Anyone have any ideas as to why I am having so much crankcase pressure? I cant think of anything else.

Thanks for the help
Brian

xupkid2 · 04-10-2007, 09:28 AM

Im still stumped because I replaced all the seals on my motor including my air oil seperator along with the dip stick. I also have brand new rings in the motor as I rebuilt it this past winter. When I checked the J-boot there was no standing oil, just residue. I just cant figure out how to relieve this crankcase pressure problem blowing out my oil dip stick. I assume it is a bad thing because it never happened before I rebuilt the motor.

Its weird because at idle I am around 900 rpm, when I pull the dipstick or open the oil fill top the RPM drops. I assume this is due to the pressure being relieved.

Any additional ideas. This is a stumper.

Thanks for the help
Brian

mlue · 09:48 AM

Quote:

Originally posted by xupkid2
Im still stumped because I replaced all the seals on my motor including my air oil seperator along with the dip stick.... I just cant figure out how to relieve this crankcase pressure problem blowing out my oil dip stick. I assume it is a bad thing because it never happened before I rebuilt the motor.

Its weird because at idle I am around 900 rpm, when I pull the dipstick or open the oil fill top the RPM drops. I assume this is due to the pressure being relieved.

Any additional ideas. This is a stumper.

Thanks for the help
Brian

You changed the dip stick or the seal? Is it the same size... everything?

Are you over filling the oil? Did you by any chance change the Oil pan to one with the baffle? If so are you over filling by mistake, some cars/years can stand overfilling some can't.

xupkid2 · 04-10-2007, 09:59 AM

I did not replace the dip stick. I did replace the seal. Also I did add a baffle to the pan. Sounds like I may be over filling it potentially. I fill up to the top of the dipstick because I am trying to avoid the #2 journal failure I had last year but sounds like that may be overfilling it?

Thoughts?

nynor · 04-10-2007, 10:40 AM

um... what do mean by 'i fill up to the top of the dipstick'? the top top? if you are filling much past the full line, i think it could be problematic.

xupkid2 · 04-10-2007, 10:53 AM

No Im just filling it up the the top of the indicator mark on the dip stick. Normally I kept it around 3/4 but since I blew my motor last year I was keeping it up to the top.

nynor · 04-10-2007, 11:07 AM

do you mean the top line, as in the fill line, or the top of the flat part.

if you just keep it at the full LINE, all should be well.

xupkid2 · 04-10-2007, 11:14 AM

The top of the fill line. There are 2 lines at the top within approximately 1/8" of eachother and I keep it at the top of the upper line. When changing my oil its taking me a approximately 6.5 quarts to get it to the top of that line.

onZedge · 04-10-2007, 11:50 AM

Just a long shot, BUT did you install a different air/oil separator? There is an orifice inside the top connection nipple. Check to see if it is plugged. That's how the vapor gets out. I read somewhere that the orifice size for the N/A vs. Turbo is different. I think maybe on a racing forum somewhere.

mgdotcom · 04-10-2007, 11:57 AM

Years ago I rebuilt a Izuzu trooper engine and withinabout 200 miles I had extreamly high crankcase presure like you describe... and now the bad news.....
I found that the rings were not proply gapped and when they expanded they all cracked

. I would look into a leakdown test and see if it shows and crankcase pressure leaks.
I hope I am worng for your sake or pulling yet another engine .
Good Luck.