18R rattle

[StuRT104]

Howdi all im new the corona scene and dont know much about the engines or many engines as a matter of fact. I have an 18R with an auto trans on my RT104( i have many coronas) anyway to cut to the chase. When the engine is underload it is making a clicking sound. I changed the oil and fiddled around with my distributor, still no difference. It sounds like the rockers or tappets rattling, but really i have no idea.The sound is loudest when i was listening to the pulley that turns the fan so could it be the timing chain/belt(dont know which one my engine has) that is making this sound?

Has anyone else had this problem?

Any help would be great guys,
Cheers

[StuRT104]

any ideas?????

[MWP]

Could be anything... tappets, a big-end, timing chain, etc.

Setting tappet clearances is quite easy to do, so that might be the first thing to try.

[hosking9898]

yer most likely chain rattle mine was the same

[StuRT104]

how did ya get rid of ur rattle benji?

[blueRA40]

I had the same problem in an RA40 was the timing chain death rattle. turned out being a chain tensioner had broken and was loose in the chain cover not pretty I just got a new timing chain kit cost me $80 came with chains tensioners and gaskits a couple of hours in the shed and was all sweet. you will be amazed how quiet it is now.

[ra_28]

Top timing chain on the 18r are very prone to rattle. Usually the noise is quite in the morning when the oil is cold and thick and as the oil heats up it gets louder. Replace the chain, 18r and timing chain rattle go hand in hand.

Cheers
Alex

[StuRT104]

thanks heaps guys ill buy a timing chain kit asap n change it all over and see how she goes, ill keep ya posted.

Cheers

[hosking9898]

how did ya get rid of ur rattle benji?

well i changed the oil it made a bit of difference then i bought a timing chain kit no rattle at al after but i will have my 18rg soon cant wait

[Dust]

I get a similar rattle when i run 91ron, I get it all the time, when i run 98ron i only get it under decent load, going up a hill etc.

[allencr]

I get a similar rattle when i run 91ron, I get it all the time, when i run 98ron i only get it under decent load, going up a hill etc.

Any cam noise isn't dependent on, or affected in any way, shape or form, by octane or load. It only cares about RPM and a little bit about overrun.
That's not 'cam noise', it's Detonation/pinging/spark knock.

[Dust]

Any cam noise isn't dependent on, or affected in any way, shape or form, by octane or load. It only cares about RPM and a little bit about overrun.
That's not 'cam noise', it's Detonation/pinging/spark knock.

Thanks, I was referring to the original post as his symptoms sound the same as mine.

[StuRT104]

That chain is gettin pretty bad now noise is really loud when car starts for the first 5 seconds, sounds like cam bearings or something my mate reckons. How hard are they to change? i havent ever worked on an 18R

[MWP]

They can be a bit of a pain in the ass to change, but nothing some swearing and extra time cant fix.
There is no reason why it cant be done at home with your avg set of tools.

[allencr]

sounds like cam bearings or something my mate reckons. How hard are they to change?

I go for 'something', like chain, sprocket, tensioner & guides AND the tensioners oil supply about 99.99% of the time, and go for 'cam bearings' the other 0.01%.