New 6.2 owner with probs

[brighty]

Hi all,
I'm new here, so point me in the right direction if I'm a bit off track.

I recently bought a toyota truck that's had a 6.2 dropped into it. I'm still trying to source what it came out of and what model/year is was built. Is there any way to do this... engine No etc????

I'm having issues with a build up of too much oil pressure. Was told that some engines came out with a breathable oil filler cap, sourced one but that hasn't fully rectified the problem as it keeps pushing oil out the seal where the oil filler neck goes in and also out of a rocker cover gasket on the left side of the engine. Not to mention an already leaking rear main oil seal.

I need to fix this problem so I can get out 4wding again.... I'm getting itchy feet. ;)

[farmerherb]

Buddy I think you have big time blow-by not oil pressure. When the engine is running, is there a good amount of pressure and/or oil spray coming out ?

[brighty]

it's giving a good 20PSI whilst running warm. And goes up as revs get higher.. but didn't test at what pressure it levels out at. (I have no tacho either so can't test against RPM.)

what do you mean by "oil spray???"

What is the best way to test for blow-by?? Compression test???

[Robyn]

There should be a CDR valve that hooks to the oil fill tube and has a hose to the air plenum under the air cleaner. Be sure this is hooked up and working properly. The CDR provides for a small vacuum in the crank case to prevent oil leaks and clears the blow by fumes.

[DmaxMaverick]

Is this engine turbo charged?

If so, the CDR (as described by Robyn) could be mis-routed. It should be either connected to the oil filler pipe, or the right side (your driver/our passenger side) valve cover, depending on the engine model, and vent into the intake just below the air cleaner. The CDR looks like a tin can with pipes in/out, approximately 3" diameter and 2" tall. If it is piped into the intake AFTER the turbo compressor, you will get boost pressure in your crankcase, and blow all the seals you mention, and probably more. The CDR needs to be vented to atmosphere (messy), or, ideally, into the intake BEFORE the air gets compressed.

If you have no turbo, the CDR could be plugged up, missing, or mis-routed. It is ideally installed to vent into the intake stream, where slight vacuum is present.

Give us a little more info about that engine, and help will come easier.

What color is the block painted (original paint, not repaint)

Which intake plenum do you have? Does it have EGR (valve with vacuum diaphram in the middle of the intake)? How many nuts hold the cover on, and what is the orientation (forward/back or left/right) Doesn't matter if it's custom. Is there 3/4" tubing going into each side of it on the sides, and where were they piped from?

That, and any other thing you can think of will be helpful.

And BTW, welcome to TDP, mate!!

[brighty]

Hey Mav, thanks for the info.

To shed a bit more light on the problem.

the CDR is located ontop of my rocker cover and goes in just below the intake, just as you described. It has no turbo fitted.

As Robyn stated, I have a pipe that comes off the side of the filler tube..... but has a stopper plugging it, will this affect what s happening???

If the "plenum" is the whole intake unit that bolts to the heads.... To my knowledge(last time I pulled it off) it has no diaphram or the like in it.

as for the original colour of the block... think it wasblack as far as I can tell... definitely no red there.

There is minimal blow-by too... had a diesel mechanic mate to have a quick look while he was over just before. dropped the belts off so no wind off the fanand definitely not excessive. Was thinking, might be blocked gauze in the rocker cover where the CDR fits to??? Maybe???

I was maybe thinking of getting another rocker cover with the the CDR and putting it on the other side too... tapping it into the other line so both side are breathing well. Is this a bad idea??? I know it's not the answer to the prob, but may help.

that's about as much info as I can give at the moment... if any more is needed just ask and I'll try my best... I'm no mechanic, but I'll have a go!!! ;)

[NH2112]

The block casting number can tell you a little about when the engine was made, but as there were only 3 or 4 different blocks made in the 6.2l's 12-year GM production run it won't narrow things down much unless the last 3 digits are "599" (92 or 93 engine.)

WRT the plugged tube on your oil filler neck, it sounds to me like someone either removed the original CDR setup (which "sucked" crankcase vapors from the oil filler neck) and swapped to the later style where the CDR valve is on the valve cover, or else an earlier oil filler tube was put on an engine with the later-style CDR setup. I'd go ahead and clean out the right-side valve cover to see if it has any effect, and if not then I'd replace the CDR valve. Temporarily replacing it with a "road draft tube" like off-road diesels use would quickly determine whether it's a CDR problem or just good healthy oil pressure. The CDR valve should be considered a "tune up" item just like a PCV valve on a gasser and replaced regularly, perhaps on a yearly or "2 air filter" basis.