Hello guys..i need to know from your experience about zd30 head engine..please look at the picture..Attachment 41345 is the engine seriel number being rewrite by a machine shop or not?because nissan agent said its a new cyclinder head..but why is the head gasket thickness is grade 2(2 notch) is it supposed to be using grade 1(1notch) unless the head is skimmed right?Attachment 41346 im just curious
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When a head is shaved down to it's limit a thicker gasket is used to compensate for the shave. Not the best head to own in that case. That's if I understand your problem correctly.
So if it really is shave and thicker gasket is use..thats mean its not a new cyclinder head..because from the purchased resit..its brand new
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what year car mate,be interesting to see if they even make new heads for your model still if it's an older one..
Head gasket will affect it very little, all to do with the compression rating agaisnt piston protrusion,
1 Notch head gasket
Thickness: 0.65mm
Suits piston protrusion less than 0.078mm
2 Notch gasket , T=0.70mm
thickest available Suits piston protrusion more then 0.078mm
Thicker Gasket is always supplied in Rebuild kits, Cylinder Head Kits, Unless requested.
Its 2001 nissan patrol grx 3.0..from the head gasket used bow is 2notch..which is not standard..so im not sure if the head is shaved or not..i should check the thickness of the head 1st..is there any easy way to check if its being shaved or not?
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By the way..is the crack visible after the head is pull off..and do i need to shave it before i install it?
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Problem is if it's on its last shave, you're up for a new head next time.Quote:
Originally Posted by SupRob
How do i know if its the last point of shave?is it like this?Attachment 41386the mirror seem to touch the bolt a bit
If there is a next time..its time to go for 4.2 i guess..
Seekers,
What is wrong with yours?
Here is a picture of a new bare head - no engine number - so I don't know how you can tell new from re-worked, as there would be an engine number hand stamped in both cases
Attachment 41400
There has to be a spec somewhere. Not sure if it's in the manual?Quote:
Originally Posted by seekers282
Engine serial numbers should be on the block and not the head ( check against rego papers)
I suspect you may be looking at a part or casting number
Engine number on ZD30's are infact on the head,
I will pull a head off the shelf and see if I can measure it for you,
Rob,
This is the story..last year it was overhaul by the nissan bousted in my country..and from the purchase paper,its genuine nissan cyclinder head..and after a year..it got symtoms of head gasket blown/crack head..so pull of the head..and i notice the "new" head is using a 2notch(which is thicker than standard)..and by the number on the head..its like being rewrite..so im suspecting that they are using my old head last year by rewriting the new engine number and and shave it then using a thicker gasket..so im curious..just my theory..
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Standard Head Thickness: 6.177 - 6.185
Rob,
Well investigated. They could have been trying to rip you off. Where are you located?Quote:
Originally Posted by seekers282
wouldn't surpise me ,ppl are trying to ream you at any opportunity.
Very few honest ppl left in the world except the ppl on this Forum lol
Im from brunei..yeah maybe they are trying to rip me off..now im doing the overhaul by my brother and me..no more rip off..lol..
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If you're in Brunei then an obvious question springs to mind. Why don't you have a 4.8? Absolutely bulletproof engine.
4.8?well..there is no 4.8 engine in my country..not even a half cut ..
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