Timing Chain Noise????

[chebetio510]

Ok so my dime has been making what sounds like a loose timing chain hitting something.. i take off oil cap and definately here noise louder.

The weird thing is that i havent lost power... motor runs strong ass hell... and it doesnt always make the noise!!! it can idle smooth and quiet for ever. one minute the next minute noise will come back.... theres days no noise at all.. Any Help GReatly appreciated,,

 

And my dads 720 has same thing except he keeps breaking timing chain guides every 1 month at the most... feaken weird..

[Rollover_Red]

Ok so my dime has been making what sounds like a loose timing chain hitting something.. i take off oil cap and definately here noise louder.

The weird thing is that i havent lost power... motor runs strong ass hell... and it doesnt always make the noise!!! it can idle smooth and quiet for ever. one minute the next minute noise will come back.... theres days no noise at all.. Any Help GReatly appreciated,,

 

And my dads 720 has same thing except he keeps breaking timing chain guides every 1 month at the most... feaken weird..

 

im having the same problem....... ill keep looking in case there is any luck........ im scared my motor is gonna blow..........

[HRH]

Take off your valve cover and look on the bell to see if the chain is eating away at it. Then look down in the cavity and see if your tensioner is still tensioning or if it's loose.

[banzai510(hainz)]

Like HRH said,

Look down front cover and see if anything obvious.

also If a long bolt was used in the lower stat housing and cause a wear mark.

 

a broken slack side guide upper or lower bolt? meaning only one bolt is hold the slack side guide.

PS ck the alternator housing to make sure the noise isnt comming from there making it look like a front cover/timming chain proplem. Loose water pump bolt. the long one!

[datsunaholic]

I've actually broken the long guide rail, so that it flops around and makes a ton of chain noise. Kind of common with the cheap Chinese timing sets.

[Rollover_Red]

my problem was the alternator........ *fixed*

 

thanks again guys.....

[banzai510(hainz)]

my problem was the alternator........ *fixed*

 

Banzai says!

Its hard being a PIMP!

[Loren]

my l20b has a half wine/half whistle that seems to match the rpm's. it kinda reminds me of the sound a blowers belt drive makes,which seems kinda cool except that i know i don't have a blower,so the sound must be a bad thing. i think it started when i replaced the alternator,but i'm not sure because there are so many other noises due to the l16 exhaust hitting the bell housing,and sometimes the body itself. that and the trans. has worn gears,and/or bad syncros (it pops out of 2nd,& is stiff going into 1st ,2nd,& sometimes reverse.) i know i'm in for a trans. swap as soon as i can find one. i need a Z 5 speed,or at least a non-dogleg 5 speed. anyway,i'd like to track down the cause of this whining sound before some real damage . any ideas? something related to the alternator/belt maybe? thanks- Loren

[banzai510(hainz)]

Loren

Did yu cahnge anything late on this. Sometime people put to ;ong of a bolt in the lower stat housing and it pushes on the chain tensioner. If thsi hasent been removed then this isnt it.

I think the tensioner is out far enought where is cocked and wearing on the metal. or maybe something on the slack side timming chain guide. Have to open valve cover and look down.

 

http://olddatsuns.com/620tech.htm

olddatsuns.com has a my timming chain vid so give you more of a clue to make yourself half way dangerous.

[datzenmike]

Does it do this with motor running but car still?? If so it's motor related. If only when driving it could be in the drive train.

[GUS-GUS]

It can be many things i had the same issue(for a day) thought it was the tensioner but it appeared that i was running on low oil, filled it up and on i went haven't had a problem but check my oil constantly. Do what HRH said too.

[Ed-datsun521]

my problem was the alternator........ *fixed*

 

thanks again guys.....

was your bottom bolt lose ?!