Bad Knocking/Rattling Sound - BMW Forum - BimmerWerkz.com
3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

 
LinkBack Thread Tools Display Modes
#1 (permalink) Old 03-08-2006, 07:10 PM
2nd Gear Member
 
JoeMadoo's Avatar
 
Join Date: Dec 2005
Location: Victorville, CA
Posts: 396
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
JoeMadoo is on a distinguished road
Send a message via AIM to JoeMadoo Send a message via MSN to JoeMadoo Send a message via Yahoo to JoeMadoo
(Thread Starter)
Unhappy Bad Knocking/Rattling Sound

In the past few weeks, I've noticed a horrible Rattling sound coming from either my valve cover or intake manifold. It seems to be getting louder as time goes on. I adjusted my valves twice to spec (.25mm). It goes away after about 1500 RPMs or so, but its very annoying at idle, especially low idle at about 600. I recently rebuilt this engine, new gaskets, hoses, cleaned.

Thanks to anyone who has any advice. I'm thinking about recording this rattle and uploading it if that will help at all.

86 Alpine White 335is M30 Swap <br>My Car Domain
ASE L1 Smog Certified

JoeMadoo is offline  
Sponsored Links
Advertisement
 
#2 (permalink) Old 03-09-2006, 08:23 PM
5th Gear Member
 
Join Date: May 2004
Location: NC
Posts: 1,118
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Starmavin is a jewel in the rough Starmavin is a jewel in the rough Starmavin is a jewel in the rough Starmavin is a jewel in the rough
Sounds most like the rockers are not holding their adjustment, use lock-tite on the nut. Also put a scratch mark on the stud side of the adjuster to see if it didn't strip out. Rare, but it could be a cause. The last thing is to start it with the valve cover off for a moment to make sure that the oiler is squirting where I should.
Starmavin is offline  
#3 (permalink) Old 03-13-2006, 11:08 AM
2nd Gear Member
 
JoeMadoo's Avatar
 
Join Date: Dec 2005
Location: Victorville, CA
Posts: 396
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
JoeMadoo is on a distinguished road
Send a message via AIM to JoeMadoo Send a message via MSN to JoeMadoo Send a message via Yahoo to JoeMadoo
(Thread Starter)
Well when i double checked the valves a few weeks later they were in the same position. I did start it with out the valve cover, the oil squirters seem to be working fine. It sounds like its coming more from the intake manifold because when i ran the car without the valve cover, the sound didnt change at all...

86 Alpine White 335is M30 Swap <br>My Car Domain
ASE L1 Smog Certified

JoeMadoo is offline  
#4 (permalink) Old 03-13-2006, 07:09 PM
5th Gear Member
 
Join Date: May 2004
Location: NC
Posts: 1,118
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Starmavin is a jewel in the rough Starmavin is a jewel in the rough Starmavin is a jewel in the rough Starmavin is a jewel in the rough
Tough one. And the car runs good? No idle problems?
Starmavin is offline  
#5 (permalink) Old 03-13-2006, 07:43 PM
2nd Gear Member
 
JoeMadoo's Avatar
 
Join Date: Dec 2005
Location: Victorville, CA
Posts: 396
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
JoeMadoo is on a distinguished road
Send a message via AIM to JoeMadoo Send a message via MSN to JoeMadoo Send a message via Yahoo to JoeMadoo
(Thread Starter)
It runs fine... The idle fluxuates from about 800-900, but it's done that for as long as I can remember. The raddle sound isnt linier with the clicking from the valves either, it dosent seem to have anything to do with the head. I took off my T/B, ICV, Cold Start Valve, AFM, and cleaned the crap out of it. I might take the intake manifold off tomorrow, that seems to be where its coming from.
It's more embarrasing than annoying, you can hear it from 100 feet away.

86 Alpine White 335is M30 Swap <br>My Car Domain
ASE L1 Smog Certified

JoeMadoo is offline  
#6 (permalink) Old 03-13-2006, 09:43 PM
Teh Peetsa Gai
 
ldsbeaker's Avatar
 
Join Date: Apr 2004
Location: Havelock, NC
Posts: 3,478
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
ldsbeaker has a reputation beyond repute ldsbeaker has a reputation beyond repute ldsbeaker has a reputation beyond repute ldsbeaker has a reputation beyond repute ldsbeaker has a reputation beyond repute ldsbeaker has a reputation beyond repute ldsbeaker has a reputation beyond repute ldsbeaker has a reputation beyond repute ldsbeaker has a reputation beyond repute ldsbeaker has a reputation beyond repute ldsbeaker has a reputation beyond repute
OT: what kind of suspension do you have to accomplish the 1.6" drop? ... and while you're recording your rattle, can you record your magnaflows? maybe a flyby, and a couple revs from idle? I'm curious to hear it. Dude, are you on R3v or E30tech?

'86 325es (TURTL3): PJ peetsa hawler
'87 535is (BADWATER): almost done... really.
'86 325e (GRN HLL): DD/show/rocket
'04 x3 3.0i: Wife's Bimmer (manual, woot!)
My BMW Blog
ldsbeaker is offline  
#7 (permalink) Old 03-13-2006, 10:33 PM
2nd Gear Member
 
JoeMadoo's Avatar
 
Join Date: Dec 2005
Location: Victorville, CA
Posts: 396
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
JoeMadoo is on a distinguished road
Send a message via AIM to JoeMadoo Send a message via MSN to JoeMadoo Send a message via Yahoo to JoeMadoo
(Thread Starter)
Sure Man. Ill put them on my site and post some links tomorrow.
I bought B+G Springs off Ebay for about $150.
I'm kinda new to the forums thing, this is the first site I signed up for...

86 Alpine White 335is M30 Swap <br>My Car Domain
ASE L1 Smog Certified

JoeMadoo is offline  
#8 (permalink) Old 03-14-2006, 07:03 PM
2nd Gear Member
 
JoeMadoo's Avatar
 
Join Date: Dec 2005
Location: Victorville, CA
Posts: 396
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
JoeMadoo is on a distinguished road
Send a message via AIM to JoeMadoo Send a message via MSN to JoeMadoo Send a message via Yahoo to JoeMadoo
(Thread Starter)
Talking

Here are a few mp3's and an MPG:

Next to Exaust:
http://www.cheeseware.com/mp3/exaust1.mp3

Underneath Exaust:
http://www.cheeseware.com/mp3/close_exaust.mp3

Pulling Away:
http://www.cheeseware.com/mp3/start.mp3

Driving Towards the Camera:
http://www.cheeseware.com/movies/aproach.mpg

I couldn't really record the rattle becuase the valves kinda block it out...

86 Alpine White 335is M30 Swap <br>My Car Domain
ASE L1 Smog Certified

JoeMadoo is offline  
#9 (permalink) Old 05-08-2006, 03:39 PM
1st Gear Member
 
Rfitz25's Avatar
 
Join Date: Apr 2006
Location: San Diego, CA
Posts: 210
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Rfitz25 is on a distinguished road
Unhappy rev limiter, autocross, valves tap tap tap...

Hello,

(Hey Starmavin )

Good thread I think I hurt my valve train this weekend.

Got new springs, shocks, awesome, ran an autocross yesterday, hauled butt. totally different car. very flat. What a blast. On the rev limiter in the last section every run, 2-3 pops. (got 6 runs in)
Didnt think this would hurt anything.

After parked it, got my helmet off,
started it up for fun runs, had a bad loud ticking. uuuuggghhhh....
Skipped the fun runs and limped home at 2-3k rpms to be safe..
Runs fine but scary tap tap tap sound.
Kinda goes away as revs go up.
I think its coming from under the valve covers.
I'll try and check it out tonight.
Hope its just adjustment or some parts I can get oo without taking off head.
My mechanic suggested 30/100ths of a mm on the valve clearance instead of the spec (28 I think?).
He thought it sounded like the valves were too tight before at idle.
Maybe he was right.
He said he always does this when he does a valve job on an older E30/M20's

Thanks for any sugestions.
I'll try what Starmavin said tonight.
If i stripped the adjuster I can replace it right?

I'll read the Haynes manual tonight adn get some more tools.

lock-tite
90 feelergauge
new gasket??
etc

,Richard

Cheers,
Richard Fitz
'87 325is Delphin Metalic

Rfitz25 is offline  
#10 (permalink) Old 05-09-2006, 01:14 AM
2nd Gear Member
 
JoeMadoo's Avatar
 
Join Date: Dec 2005
Location: Victorville, CA
Posts: 396
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
JoeMadoo is on a distinguished road
Send a message via AIM to JoeMadoo Send a message via MSN to JoeMadoo Send a message via Yahoo to JoeMadoo
(Thread Starter)
Hey, im sorry to hear that. I found out what my rattle was a while ago.

I noticed the power steering pump was shaking alittle bit and so was the crank hub. I went under to see what i can see and 3 out of the 6 crank hub bolts were missing, and the 2 of the remaining 3 were hand loose. There was one left the was somewhat tight. Also one of the 4 bolts that mounts the Power steering pump was also missing. So i got some new crank bolts and a power steering bolt, torqued them to spec this time :-), and the rattle was gone.

It sounds like your click is your valves if it is constant. Also check to see anything shaking.

86 Alpine White 335is M30 Swap <br>My Car Domain
ASE L1 Smog Certified

JoeMadoo is offline  
#11 (permalink) Old 05-09-2006, 02:03 PM
1st Gear Member
 
Rfitz25's Avatar
 
Join Date: Apr 2006
Location: San Diego, CA
Posts: 210
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Rfitz25 is on a distinguished road
Smile slipper rocker arm ;) fixed

Hey guys,

I found my big ticking.

Thanks for all the posts, they helped.

One front exhaust port rocker arm had slipped forward along the rocker arm shaft and was riding only half on the cam shaft. I slid it back and the retaining bracket clicked into place and it ran fine.
I'm hoping the last guy did a valve job and just didn't seat it right.
If it happens again I'll try and replace the retainer and spring etc.

Hey how do you check the valve clearance? Get it on a flat spot of the cam and put the feeler gauge between the rocker arm and valve stem???
I couldnt get the gauge into it?
( BTW Second gear worked fine to roll the motor/cam around)
My mechanic said to set them to 30/100ths of a millimeter, looser than spec?. This seems thin. Whats the spec? ('87 325is)
Haynes manual wont tell you how to do it. LOL :lol:
Maybe I need the Bently manual.??

I'll look for more loose bolts on power steering etc like you suggested too.
Good idea.

Cheers,
Richard

Cheers,
Richard Fitz
'87 325is Delphin Metalic

Rfitz25 is offline  
#12 (permalink) Old 05-10-2006, 01:52 AM
2nd Gear Member
 
JoeMadoo's Avatar
 
Join Date: Dec 2005
Location: Victorville, CA
Posts: 396
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
JoeMadoo is on a distinguished road
Send a message via AIM to JoeMadoo Send a message via MSN to JoeMadoo Send a message via Yahoo to JoeMadoo
(Thread Starter)
Spec is .010 inches or .25 mm. They are painless to do, i got a set of bent feelers, that makes it a bit easier.

86 Alpine White 335is M30 Swap <br>My Car Domain
ASE L1 Smog Certified

JoeMadoo is offline  
#13 (permalink) Old 05-10-2006, 05:16 PM
1st Gear Member
 
Rfitz25's Avatar
 
Join Date: Apr 2006
Location: San Diego, CA
Posts: 210
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Rfitz25 is on a distinguished road
Thumbs up OK .25mm - .30mm valve gap makes sense

Mr Magoo,

Thanks a bunch.

Now it makes sense.

mechanic said 30 100ths of a mm he must have meant 30 tenths of a
mm == .30mm
I have one gauge thats .305 should do the trick but .25 sounds like it would work better. Sinse smaller is quieter and more power?

Might try again tonight.

I think the spec on the 325is might be .28 not .25 have to look it up.

Yeh I read another post and bought the 45 degree feeler gauges.

Much easier to get in and out.

(...thats what she said) lol

BTW. looked for loose bolts last night and found broken vacume hose on intake. replaced it, much smoother idle. Must have broke it Sunday.

I also think I stretched my throttle cable and the lock nut is missing on the other cable that I dont know what it is. goes t some weird black contraption in front left corner. tightened em both, runs good, need to find one of those tiny tiny nuts. Probably should ad a lock washer maybe? or a little locktight.
Looks like it backed off and fell off.

Only had the car month, still learning some of the systems.

Hauls butt though.

Cheers,
Richard

Cheers,
Richard Fitz
'87 325is Delphin Metalic

Rfitz25 is offline  
#14 (permalink) Old 05-10-2006, 06:07 PM
2nd Gear Member
 
JoeMadoo's Avatar
 
Join Date: Dec 2005
Location: Victorville, CA
Posts: 396
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
JoeMadoo is on a distinguished road
Send a message via AIM to JoeMadoo Send a message via MSN to JoeMadoo Send a message via Yahoo to JoeMadoo
(Thread Starter)
Awesome, glad to hear its runnin good!

86 Alpine White 335is M30 Swap <br>My Car Domain
ASE L1 Smog Certified

JoeMadoo is offline  
Sponsored Links
Advertisement
 
Reply

  BMW Forum - BimmerWerkz.com > BMW Model Specific Forums > 3-Series (E21, E30)


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Similar Threads
Thread Thread Starter Forum Replies Last Post
2001 E39 528i - Rear Clanking Sound huikb 5-Series (E12,E28, E34, E39, E60) 1 04-04-2006 09:55 AM
Faint "knocking" sound when window fully closed jonnyc 3-Series (E46, E90) 4 02-22-2006 01:54 PM
New to the board..universal muffler question QickSilver323 3-Series (E46, E90) 8 11-17-2005 12:20 PM
Engine Sound htp.bmw 3-Series (E21, E30) 4 02-17-2005 10:12 PM
help the sound of my 318i mikester328 3-Series (E36) 1 09-20-2004 09:34 PM

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome