Valve sound

[dikolotour]

Hi there

I have bought my hachi two weeks ago. The previous owner told me that he had rebuilt the engine.

I don't dought about it because the engine works preety well.

But this week every morning when i start my engine i hear a noise like valve knocking till the engine gets to its normal temperature. Then the sound stops (maybe there is a sound but not so loud as in the begining)

Is this normal?

Perhaps my engine oil is wrong. I use 15/40 mineral. I have change it 1000 km ago.

The rebuilt took place 40000 km ago. Should i have to adjust my valves?

Tell me your opinion

[domi]

I've heard of minor 'valveknock' even on engines that have intrusionless geometry immediately after a rebuild, but i'd say 40 000 km is well enough not to consider it a fresh build.... Don't know, waiting for the gurus to say, i guess..

[NoHachi]

Could you check whether the noise gets louder after you rev the engine and suddenly close the throttle?

Temperature dependent knock noises always make me think of a conrod bearing failure

[dikolotour]

No

If the engine comes to its normal temperature the sound dissapears (maybe it is not so loud)

If i rev the engine and suddenly cut the throttle nothing happens. Everything works normal.

[jamiemirror]

Use quality oil filter (genuine Toyota is cheap and good). Change the oil too with some like 10-40 semi-synth. IMHO change the oil and filter immediately.

[dikolotour]

I do use the genuine oil filter but i'll try different oil

[domi]

Try switching from mineral to semi-synth, could make all the difference you need...

[Akis308]

Τhis noise, was there from the the first day you took it???
Or it has appeared after a while???

[gon]

I sense con rod bearing caps .......
If it is , u should change them before the crank gets damaged .....

[dikolotour]

@ Akis 308

I haven't notice it from the first day, but maybe i didn' t pay so much attention these first days.

@ gon

I'll check it out man. Thanks a lot