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> Need help with engine noise, Noise ID - rod knock
watsonrx13
post Mar 15 2009, 06:21 AM
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I need some help identifying an engine noise. Let me know if this is a major problem or something simple I can fix.... Here's the link...

-- Rob
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904svo
post Mar 15 2009, 08:19 AM
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It sounds like you need a valve adjustment or the rockers are worn bad.
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FourBlades
post Mar 15 2009, 11:33 AM
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> Need help with engine noise.

How's this: Braaaaaaaaa, bah bah bah, braaaaaaaaa!!!!

(IMG:style_emoticons/default/av-943.gif)
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underthetire
post Mar 15 2009, 12:19 PM
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Sounds just like my car did when it sat for years. Mine had the following noises:

I have hydraulic lifters in mine. They had pumped down and stuck that way. Ran a quart of ATF through the engine at a fast idle for about an hour. Drained oil, re-filled with cheap oil and half quart of marvel mystery oil. Drove 300 miles or so. Changed the oil again with good diesel oil and it's been trouble free.

Fan belt was loose, rubbing on the fan housing. It made a similar sound.

My guess is valves out of adjustment if you have solid lifters.
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Joe Ricard
post Mar 15 2009, 01:01 PM
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Other than it idling high. there is some valve noise.

I still say like I did 2 months ago run it. Adjust the valves and run it. Quit worrying about it and run it.

Then I would run it some more. Maybe even race t.

If it blows it was bad
if it holds together run it some more.

Have I mentioned I would run it?
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watsonrx13
post Mar 15 2009, 02:33 PM
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QUOTE(Joe Ricard @ Mar 15 2009, 02:01 PM) *

Other than it idling high. there is some valve noise.

I still say like I did 2 months ago run it. Adjust the valves and run it. Quit worrying about it and run it.

Then I would run it some more. Maybe even race t.

If it blows it was bad
if it holds together run it some more.

Have I mentioned I would run it?


Thanks Joe, I already knew your answer, I was just getting a second opinon..... (IMG:style_emoticons/default/shades.gif)

Would this be a problem to a potential new owner? I'm going to put it up for sale soon, should I mention that I think it's making a strange noise?

BTW, I've adjusted the valves several times, but they always stay within tolerances....

-- Rob
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r_towle
post Mar 15 2009, 02:46 PM
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You may not be adjusting the valves correctly.
It should be fine, Run it.

Rich
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jc914
post Mar 15 2009, 04:17 PM
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I have to agree it sound like Valve adjustment is needed. Mine did sound a bit like yours after being stored. I did a valve adjustment and it was gone. I might want to change the vacuum hoses. Good Luck selling
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watsonrx13
post Mar 15 2009, 05:23 PM
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Thanks guys, I'll get someone to look over my shoulder next time to make certain I'm adjusting them properly.... After that, hopefully I won't be bothered by the noise and I can drive it like I stole it..... (IMG:style_emoticons/default/biggrin.gif)

-- Rob
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Jake Raby
post Mar 15 2009, 05:44 PM
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Nope, thats a rod... either small end or big end. The video makes it hard to tell, but it seems too fast paced for a valve train related issue

When did this start? any other symptoms?

Time to drain the oil through a paint strainer to see what comes out with it and pull the oil pick up strainer to see whats there as well..

It really sounds like a small end rod knock to me..

Pul each spark plug wire while the engine is running and see if any one of them makes the noise quieten down. If it does, thats the cylinder with the issue..

This post has been edited by Jake Raby: Mar 15 2009, 05:45 PM
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carr914
post Mar 15 2009, 05:50 PM
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QUOTE(watsonrx13 @ Mar 15 2009, 04:33 PM) *


Other than it idling high. there is some valve noise.

Would this be a problem to a potential new owner? I'm going to put it up for sale soon, should I mention that I think it's making a strange noise?


-- Rob



Absolutely, Rob, your my friend, but if you don't get this fixed and don't disclose it, you open yourself to a whole new set of problems.

T.C.
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carr914
post Mar 15 2009, 05:52 PM
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Jake I knew you would have the answer. I told Rob a while back to make an audio and send it your direction.

T.C.
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URY914
post Mar 15 2009, 07:06 PM
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Rob,

Rod. (IMG:style_emoticons/default/biggrin.gif)
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Joe Ricard
post Mar 15 2009, 08:06 PM
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Ya'll sould have heard it before he sealed up the exhaust.
I think it is noisy exhaust

Maybe you got a lopey cam


I crack me up......
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watsonrx13
post Mar 16 2009, 04:43 AM
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Jake, thanks for the suggestions, I'll follow through and let everyone know...

TC, that's why I wanted to find out what the problem is before I sell it....

-- Rob
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watsonrx13
post Mar 30 2009, 06:31 PM
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Well, since I couldn't figure out the noise, I decided to remove the engine and rebuild it... Here's where I'm today..... I can't figure out how to remove the main bearings or the cam bearings.... Also, does anyone see any problems yet? Tomorrow I'm planning to remove the con rods, then take the crank, cam, con rods to the machine shop for measurements.... Is there anything else I shoud take?

Attached Image

Attached Image

-- Rob
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watsonrx13
post Mar 30 2009, 06:32 PM
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Cam and crank...

Attached Image

Attached Image

-- Rob
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carr914
post Mar 31 2009, 07:23 AM
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Rob, I'm meeting up with my motor guy today. I will ask him to come to the site, your thread and take a look for you. I know it's been a while since he's looked at a Type 4 since all he builds now is 911 motors, but he's got 2 good eyes. I'll let you know what he says.

T.C.
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Joe Ricard
post Mar 31 2009, 08:35 AM
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We won't know squat till he pulls the rods.
the center main bearing is hard to make out. I can't tell if that is copper or oil.
My bet is oil and will be waiting for the "I told you so" opportunity shortly.

If you remember I said it was exhaust leaks. so far I am right.

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watsonrx13
post Mar 31 2009, 04:52 PM
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I removed the con rods today, what a PITA....

Attached Image

Then I cleaned the con rods..... and guess what I found.....







wait for it....











wait for it....












I don't think I'm suppose to move this with my finger.....

Attached Image

So Jake was 100% correct and I'm glad that I tore the engine down before I caused major damage....

Jake, thanks again for your knowledge and assistance.... (IMG:style_emoticons/default/aktion035.gif)

QUOTE(Jake Raby @ Mar 15 2009, 06:44 PM) *

Nope, thats a rod... either small end or big end. The video makes it hard to tell, but it seems too fast paced for a valve train related issue

When did this start? any other symptoms?

Time to drain the oil through a paint strainer to see what comes out with it and pull the oil pick up strainer to see whats there as well..

It really sounds like a small end rod knock to me..

Pul each spark plug wire while the engine is running and see if any one of them makes the noise quieten down. If it does, thats the cylinder with the issue..


-- Rob
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