Crank case pressure?

[blue giant]

Did an oil change tonight and ran the engine with the oil fill cap off. Is it normal to have air blowing back out of the fill hole?

I did a search but didn't really find an answer.

Thanks,

Paul

[oldyam80sg]

I would think so.I have a K & N crankcase breather and it does breathe.I can see something coming out!

[The Lorax]

I've seen leaving the oil cap off in a car make a real mess. been a few years since I saw it, if I remember correctly, after a twenty minute drive, the entire underside of the hood was dripping with oil. doesn't really surprise me that it would shoot back out. in fact, I had a 1990 Volvo 740 turbo a while back and when I got it, the seal on the filler cap was bad, is routinely dumped oil all over the top of the engine....that was just with a bad seal on the cap. that's all I got, have a nice day and ride safe

[olebiker]

Paul yes it is. There is quite a lot of air movement.

[egsols]

Is it normal to have air blowing back out of the fill hole

Yes, as the pistons move up and down the air must be displaced in the crankcase somehow. Also, as the rings wear, you will also get a certain amount of blow by entering the case.

Did an oil change tonight and ran the engine with the oil fill cap off.

Why???

[blue giant]

Ernie,

Did it more by accident than on purpose. It was just when I was idling up to temperature.

I also have a very predominent tick in the top end. Sounds like its in the valve train but its hard to pinpoint. It's more pronounced on the right side than on the left.

[Erik the Red]

I'm not disagreeing -just adding...

Originally posted by The Lorax
I've seen leaving the oil cap off in a car make a real mess. ...entire underside of the hood was dripping with oil. ...routinely dumped oil all over the top of the engine....that was just with a bad seal on the cap.

I had an '84 Olds Delta 88 in college. Changed the oil at a friend's house since I was in the dorms. One oil change I went to remove the cap and it wasn't there. I looked and there it was sitting on the window sill ....from the last time I changed the oil. I'd been running for 3-4 months with no cap, and didn't have a problem. It was probably a good thing it was wintertime.

[egsols]

Originally post by Blue giant
I also have a very predominent tick in the top end............It's more pronounced on the right side than on the left.

You may want to seek immediate medical attention for that, I think there are some new medications out there that may help.

[blue giant]

Originally posted by egsols


You may want to seek immediate medical attention for that, I think there are some new medications out there that may help.

Too funny Ernie!

[petejw]

blue giant.
"I also have a very predominent tick in the top end. Sounds like its in the valve train but its hard to pinpoint. It's more pronounced on the right side than on the left."


I have that tic 2 on the right hand side as well, was still there after i had the head fully serviced. very annoying.

[blue giant]

Pete,

When I searched the site for similar problem posts I found one where the owner did just about everything to find and stop the tick and ended up swapping the head out for a used one. No more tick!

I'll check what I can to make sure I'm not going to trash the engine. This might be this winter's project.

Paul

[blue giant]

Pete!

Here the link to that thread.

Top End tick

Cheers,

Paul

[John]

Have you checked the exhaust gaskets? Mine developed a tick a few weeks ago, and I discovered a couple of loose header nuts

[olebiker]

As you know Paul I just did the head on mine (twice ): ) and now new cam chain valves all set right. The thing is still noisy I believe it is just a damn noisy engine. I also have a bigger windshield on this one and maybe it is reflecting more of the noise back at me.

[petejw]

hi Paul,
thanx for the link,
ill recheck the exhaust flange nuts, its been a while.
i did have the head fully serviced, and its quiet wen its cold
starts ticking after it warms up, been this way 4 a few years
so im not 2 fussed about it.
good luck with urs.