click on post # and copy the link from popup lol

hi gaga_84.. my car currently using Castrol magnatec...
but after 2k ,my car start eat minyak hitam...
why ah ?

not suitable.. used 15w40.. if eat minyak hitam also... used 20w50

Bukan kalau dah mula makan minyak hitam, means, the piston ring there dah haus ke? Changing to thicker oil doesnt mean the problem is solved right? Plus, usin thicker oil makes ur engine...heavy, no?

Bukan ke better to fix the issue instead?

betul tu.. selalu valve seal jer.. tak sampai piston ring...
guna thicker oil will not solve the problem but will reduce the problem... for the moment used 15w40 or 20w50

and why not the piston rings?

do u understand selalu = normally? im not saying it not caused by piston rings.

selalu = always

biasanya = normally?

okla...

selalu valve seal je cause problem.. piston ring bukan selalu..

thanks., learnt something new today

what do u learn?

i think u misunderstand there thundergod_cid
normally if makan minyak hitam it caused by valve seal.. but the possibility to piston ring to worn out is still there..
but normally only valve seal need for replacement.. based on my experience watching my friends,workshop and mine do top overhaul.. most of them dont change piston rings..but better check piston ring condition when u take out engine head.. but u can replace it if u want to do so even though the piston ring is still ok....

piston rings are a wear and tear item. sooner or later you'll have smoke through the exhaust... if not, breather pipe on top of the cam cover.

Piston may be slapping due to loose rings, bore may be eating up, etc.

thats y check the piston ring condition when take out the head.. if dont have problem no need to replace.. same thing for water pump fins... if the water pressure is still ok there is no need to replace it.. if owner have money.. just change it both.

this is how you'lls care the customer most. Why not just do a simple compression test before taking the head off? It's no guarantee that the rings are okay even if you try to move the pistons to check for slappings.

tuhan kilat..

we are talking about during overhaul.. why suddenly want to do basic compression check? YES, it will better to do compression check first..
during overhaul also u can check the piston whether got slapping or not, or you can check piston goyang or not..
when makan minyak hitam.. confirm u want to change valve seal.. physical check at piston is to confirm.
sometimes not all mechanic and workshop have the tools.

anyway if want to discuss about this better put another thread..

This post has been edited by gagak_84: Jul 12 2011, 05:10 PM

I'd trust a compression dry and wet test before performing a top overhaul anytime over trying to move your piston around. For all you know you may be losing 10psi per cylinder whilist the pistons are still tight.

what is the normal pressure during compression test.. is it the same for all engines?

~180 psi?

not same for all engines mind you

hahahaha i enjoy this post....

yeah i really enjoy...

im just always near to the engine which makes me engine-near