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The rattly engine...
https://www.ausmini.com/forums/viewtopic.php?f=2&t=57769		 Page 1 of 2
Author:  Blunder [ Fri Oct 09, 2009 10:06 pm ]
Post subject:  The rattly engine...
My 998 seems to be a little noisy!

It rattles! Seems to quieten to under load and on the go, but at idle it rattles it little 998 head off! Now i recently did the head gasket and the valve clearances, so i know all is good they!

So i'm now thinking WTF!!!!>>>???

So what are my options!? Dry lifters? Timing chain? Dodgy Alternator?!

help and direction would be great!

:roll:
Author:  gafmo [ Fri Oct 09, 2009 10:48 pm ]
Post subject: 
my guess trimming chain. with a flat blade screw driver listen to the timing & rocker covers. If theirs a major rattle you will hear it
Author:  Phat Kat [ Fri Oct 09, 2009 10:56 pm ]
Post subject: 
gafmo wrote:
my guess trimming chain. with a flat blade screw driver listen to the timing & rocker covers. If theirs a major rattle you will hear it


:lol: I'm glad I'm not the only person that uses a screw driverr as a stethoscope :D

I'm with gafmo, a common thing on the ol's A series motors that can rattle is the timing chain, the other thing is sometimes the primary gear, sometimes if they aren't assembled properly you can hear them kinda slapping or clunking at idle (sometimes if they are just worn too). It could be a lot of things... Worst case it could be you Big ends getting old,,, sometimes I have found that they almost sound like a desiel motor when they get bad, but its more like a loud ticking than a clunk... But that's pretty extreme.. hopefully thats not the case hey? :lol:
Author:  mini maxx [ Fri Oct 09, 2009 11:11 pm ]
Post subject: 
Got a good second hand Duplex timing chain and gears here if you need them( free)plus the countersunk screws or a brand new single row chain leftover from Veras rebuild($20). Just puttin it out there.
I like to help fellow Mini owners when i can :D
Author:  david rosenthal [ Fri Oct 09, 2009 11:15 pm ]
Post subject: 
Nope, it's the 1/2" af 1/4" drive socket thats missing out of your set. :shock: :shock:
Author:  mini maxx [ Fri Oct 09, 2009 11:19 pm ]
Post subject: 
david rosenthal wrote:
Nope, it's the 1/2" af 1/4" drive socket thats missing out of your set. :shock: :shock:

PHUNNY BUGGA :lol: :lol:
Author:  david rosenthal [ Fri Oct 09, 2009 11:37 pm ]
Post subject: 
mini maxx wrote:
david rosenthal wrote:
Nope, it's the 1/2" af 1/4" drive socket thats missing out of your set. :shock: :shock:

PHUNNY BUGGA :lol: :lol:


It's not funny when it happens. Have a look at the pic of the F4 head on the carby thread. That was a 6mm 1/4" drive socket that accidently fell into the carby at 8000 revs during tune-up :x :x :x :x
I test them to destruction but that was !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Author:  mini maxx [ Fri Oct 09, 2009 11:39 pm ]
Post subject: 
david rosenthal wrote:
mini maxx wrote:
david rosenthal wrote:
Nope, it's the 1/2" af 1/4" drive socket thats missing out of your set. :shock: :shock:

PHUNNY BUGGA :lol: :lol:


It's not funny when it happens. Have a look at the pic of the F4 head on the carby thread. That was a 6mm 1/4" drive socket that accidently fell into the carby at 8000 revs during tune-up :x :x :x :x
I test them to destruction but that was !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

An 8000rpm tune up :shock: Your off tap dude :shock:
Author:  Phat Kat [ Fri Oct 09, 2009 11:52 pm ]
Post subject: 
david rosenthal wrote:
mini maxx wrote:
david rosenthal wrote:
Nope, it's the 1/2" af 1/4" drive socket thats missing out of your set. :shock: :shock:

PHUNNY BUGGA :lol: :lol:


It's not funny when it happens. Have a look at the pic of the F4 head on the carby thread. That was a 6mm 1/4" drive socket that accidently fell into the carby at 8000 revs during tune-up :x :x :x :x
I test them to destruction but that was !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!


I'd ask what it was doing loose up there but I've done similar... I usually say something like

"oh but my phone started ringing and I forgot to finish tightening up that the nut for the adjuster on the rocker arm and thats how it worked loose and snapped off at 120km/h but look its ok, the spanner is right where I left it... IN THE BLOODY ROCKER COVER!!!" :x :x :x :x :x :lol: :lol: :lol:
Author:  david rosenthal [ Sat Oct 10, 2009 12:19 am ]
Post subject: 
mini maxx wrote:
david rosenthal wrote:
mini maxx wrote:
david rosenthal wrote:
Nope, it's the 1/2" af 1/4" drive socket thats missing out of your set. :shock: :shock:

PHUNNY BUGGA :lol: :lol:


It's not funny when it happens. Have a look at the pic of the F4 head on the carby thread. That was a 6mm 1/4" drive socket that accidently fell into the carby at 8000 revs during tune-up :x :x :x :x
I test them to destruction but that was !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

An 8000rpm tune up :shock: Your off tap dude :shock:


that one was not too bad, the engine that dropped a valve at 9500 did a better job. Some said that 1100 cranks were crap,but it did not break at 9500
I have a few heads to re-build, thats why I just got my W&B valve grinding gear
Author:  david rosenthal [ Sat Oct 10, 2009 12:21 am ]
Post subject: 
Sorry Gareth , back to subject. If you need a good timing chain and sprockets etc I have plenty of spares [out of these engines] I do not use them
Author:  sports850 [ Sat Oct 10, 2009 6:26 am ]
Post subject: 
Phat Kat wrote:
gafmo wrote:
my guess trimming chain. with a flat blade screw driver listen to the timing & rocker covers. If theirs a major rattle you will hear it


:lol: I'm glad I'm not the only person that uses a screw driverr as a stethoscope :D


Just make sure you don't use one of those "hitable" screwdrivers where the metal of the shaft extends through the plastic handle , I was listening for a noise in in the head (turned out being a broken spring washer from an air cleaner bolt that had been ingested through a carb :roll: ) and brushed the spark plug while the screwdrive was still touching the top of my jawbone just in front of my ear ....
Author:  Blunder [ Sat Oct 10, 2009 8:42 am ]
Post subject: 
Is it just the chains that wear or do I need to change the gears/sprockets too!? Do people recommend staying single or going dbl!? Engine is a little 998!

Thanks David and maxx may well take one of u up on the offer!
Author:  sgc [ Sat Oct 10, 2009 9:20 am ]
Post subject: 
Always replace the sprockets with the chain, they wear in together. If you've got it apart, fit a double-row chain -- they don't cost much more than the single row ones, and will stretch much less over time giving you more consistent timing.
Author:  Phat Kat [ Sat Oct 10, 2009 10:51 am ]
Post subject: 
sgc wrote:
Always replace the sprockets with the chain, they wear in together. If you've got it apart, fit a double-row chain -- they don't cost much more than the single row ones, and will stretch much less over time giving you more consistent timing.


or...................................





Get a belt kit! :D :D :D :D :D
Yeah i reckon Duplex is the only way to go personally... Its not like your have to change your sprockets and chain with your oil every few months,,, so why be a tight arse? ,,,, Lash out be a big spender!!! (they cost a whole $30.00 more than a simplex...why bother?) :D They last so much longer.... Thats if the clunk is your timing chain :shock: :shock:
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