Knocking noise under valve cover, searched all over.. - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

sepulchral · 12-31-2004, 03:41 PM

I have a DOHC KA with 143k miles
Engine runs perfect, however

It makes a knocking noise when i start it, it gets quieter after it warms up but is still very very noticable. Its pretty obvious where the noise is coming from, its coming from inside the head.

I searched all over the internals of the head, nothing appears loose, however i do not how to adjust anything in the head. I took off the timing chain guide and no noise reduction.... so i'm stumped. If it is the valves does anyone have a link to a writeup or guide on how to adjust them and what specs to use?

Thank you!

MIKE

nightwalker · 12-31-2004, 07:52 PM

look on the net for a FSM file. I believe the guys at zeroyon have it. Google buddy, google.

XxJaPxOxNeEs23xX · 01-01-2005, 12:06 PM

its either ur using too low of octane or it could be i think it was somthinglike ur sleeves are all worn out and it leaks air or pressure and it knocks

*MELLO*SOS* · 01-01-2005, 02:21 PM

I have the same problem, it's most likely your timing chain tensioner. You need to replace your chain, guides and tensioners.

240Driver39 · 01-01-2005, 04:39 PM

id guess that you took off the upper most guide, thres still one behind the upper timing chain cover.

sepulchral · 01-01-2005, 08:23 PM

i dont think its the chain the car had been sitting a long time like a year, when i changed the oil the old oil was as thick as mollasas. I think a lifter is sticking or something, anyone know any really good detergant oil additive?

l33tmonkeyman · 01-02-2005, 02:46 PM

do an oil change and add a like a half of a can of seafoam to the crankcase with the oil and leave that in there for bout a 1000 miles or so. then change ur oil out again and see if you notice any difference.

12-31-2004, 03:41 PM	#1
sepulchral BANNED Join Date: Mar 2004 Location: Midlothian. VA Posts: 2,050 Trader Rating: (0) Feedback Score: 0 reviews	Knocking noise under valve cover, searched all over.. I have a DOHC KA with 143k miles Engine runs perfect, however It makes a knocking noise when i start it, it gets quieter after it warms up but is still very very noticable. Its pretty obvious where the noise is coming from, its coming from inside the head. I searched all over the internals of the head, nothing appears loose, however i do not how to adjust anything in the head. I took off the timing chain guide and no noise reduction.... so i'm stumped. If it is the valves does anyone have a link to a writeup or guide on how to adjust them and what specs to use? Thank you! MIKE

12-31-2004, 07:52 PM	#2
nightwalker Nissanaholic! Join Date: Mar 2003 Location: Bay area Age: 46 Posts: 2,146 Trader Rating: (0) Feedback Score: 0 reviews	look on the net for a FSM file. I believe the guys at zeroyon have it. Google buddy, google. __________________ In life, we often cast the line of hope fishing for the best possible opportunity. Sometimes with enough effort, the things we catch are nothing short of amazing.

01-01-2005, 04:39 PM	#5
240Driver39 Zilvia FREAK! Join Date: May 2002 Location: Charleston, SC Age: 40 Posts: 1,090 Trader Rating: (1) Rides Gallery: 240Driver39 Feedback Score: 1 reviews	id guess that you took off the upper most guide, thres still one behind the upper timing chain cover. __________________ 1990 240sx 5spd fastback

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01-01-2005, 12:06 PM	#3
XxJaPxOxNeEs23xX Zilvia Junkie Join Date: Jun 2003 Location: california Posts: 572 Trader Rating: (0) Feedback Score: 0 reviews	its either ur using too low of octane or it could be i think it was somthinglike ur sleeves are all worn out and it leaks air or pressure and it knocks

01-01-2005, 02:21 PM	#4
MELLOSOS* LAID OUT Join Date: Mar 2004 Location: LAS VEGAS Age: 43 Posts: 2,015 Trader Rating: (1) Rides Gallery: MELLO*SOS Feedback Score: 1 reviews	I have the same problem, it's most likely your timing chain tensioner. You need to replace your chain, guides and tensioners.

01-01-2005, 08:23 PM	#6
sepulchral BANNED Join Date: Mar 2004 Location: Midlothian. VA Posts: 2,050 Trader Rating: (0) Feedback Score: 0 reviews	i dont think its the chain the car had been sitting a long time like a year, when i changed the oil the old oil was as thick as mollasas. I think a lifter is sticking or something, anyone know any really good detergant oil additive?

01-02-2005, 02:46 PM	#7
l33tmonkeyman Zilvia Member Join Date: Jul 2004 Location: Prior Lake, MN Age: 39 Posts: 215 Trader Rating: (0) Feedback Score: 0 reviews	do an oil change and add a like a half of a can of seafoam to the crankcase with the oil and leave that in there for bout a 1000 miles or so. then change ur oil out again and see if you notice any difference.