Will 12 thou off......

Ade Bentley · Oct 22, 2017

The heads on my EFI 87' 3.5 have been skimmed by 12 thou, will that be enough to
change the timing so much that the engine wont start ???????
Answers on a post card to " its got me stumped, no:1 rangie rd. rovertown ".

jamesmartin · Oct 22, 2017

Ade Bentley said:
The heads on my EFI 87' 3.5 have been skimmed by 12 thou, will that be enough to
change the timing so much that the engine wont start ???????
Answers on a post card to " its got me stumped, no:1 rangie rd. rovertown ".

no but check https://www.google.co.uk/url?sa=t&r...0Preload.pdf&usg=AOvVaw0dF2yKPwxVw92OQ55H5XD-

Ade Bentley · Oct 22, 2017

Thanks james, but when I opened it the contents was just letters & squiggles !

jamesmartin · Oct 22, 2017

mm works for me ,scroll down to tappet preload checking
https://www.google.co.uk/url?sa=t&r.../faq-gen.htm&usg=AOvVaw1ODLaeDEsfam87-CCbAkv2

Ade Bentley · Oct 22, 2017

Yeah, scrolled to bottom & still the same. Just fitted a new timing chain, cam shaft & lifters, this week ime going to reface the valves then fit the composite
head gaskets cos' I had put on the metal ones, then time it up by hand. all elecs checked & are ok. So it should start first time. Famous last words.

Ade Bentley · Oct 22, 2017

Oh I don't think the heads are 3.5, 14 bolts each side, are they from a 4.2 ?

jamesmartin · Oct 22, 2017

Ade Bentley said:
Oh I don't think the heads are 3.5, 14 bolts each side, are they from a 4.2 ?

from later engines 3.9 on that used composite head gaskets, they stopped using the other bolts to help even clamping pressure on the head

Grrrrrr · Oct 22, 2017

jamesmartin said:
no but check https://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=6&cad=rja&uact=8&ved=0ahUKEwiQwqKrlIXXAhXhLMAKHZs5Ax8QFghFMAU&url=https://www.rimmerbros.co.uk/ItemFiles/Manuals/Rover%20V8%20Cam%20Follower%20Preload.pdf&usg=AOvVaw0dF2yKPwxVw92OQ55H5XD-

Works for me but cannot copy and paste.

Gazbo · Oct 23, 2017

Ade Bentley said:
The heads on my EFI 87' 3.5 have been skimmed by 12 thou, will that be enough to
change the timing so much that the engine wont start ???????
Answers on a post card to " its got me stumped, no:1 rangie rd. rovertown ".

Timing not effected by head skimming at all, check all your efi/ignition wiring.
Does it have fuel, spark (at the correct time and order), and air, even with valve leakage it should fire up if the ingredients mentioned are present.
You could have efi problems.

Thor1950 · Oct 23, 2017

Ade Bentley said:
The heads on my EFI 87' 3.5 have been skimmed by 12 thou, will that be enough to
change the timing so much that the engine wont start ???????
Answers on a post card to " its got me stumped, no:1 rangie rd. rovertown ".

12 thousandths is the thickness of a Asia hair. I doubt things are that tight to be a issue

Pete The Biker · Oct 23, 2017

These are the links from posts #2 and #4...........

http://www.v8engines.com/faq-gen.htm

https://www.rimmerbros.co.uk/ItemFiles/Manuals/Rover V8 Cam Follower Preload.pdf

They both open Ok for me.

Pete

Gazbo · Oct 23, 2017

Thor1950 said:
12 thousandths is the thickness of a Asia hair. I doubt things are that tight to be a issue

Is that similar thickness to a "mickey bristle?"

Colthebrummie · Oct 23, 2017

How about a pubic air, could I use that to set my points?

Col

neilly · Oct 23, 2017

Colthebrummie said:
How about a pubic air, could I use that to set my points?

Col

Is it still attached to the owner??

Cheers

Colthebrummie · Oct 23, 2017

neilly said:
Is it still attached to the owner??

Cheers

Is that important?

Col

norseman · Oct 23, 2017

Ade Bentley said:
Yeah, scrolled to bottom & still the same. Just fitted a new timing chain, cam shaft & lifters, this week ime going to reface the valves then fit the composite
head gaskets cos' I had put on the metal ones, then time it up by hand. all elecs checked & are ok. So it should start first time. Famous last words.

The use of composite gaskets will reduce the compression ratio by (I seem to recall - don't quote me) 0.60, so 9.35 becomes 8.75 if that's of any interest.

Thor1950 · Oct 23, 2017

Gazbo said:
Is that similar thickness to a "mickey bristle?"

Is that like a RCH?

Ade Bentley · Oct 23, 2017

Colthebrummie said:
How about a pubic air, could I use that to set my points?

Col

I knew it would end up with silly's .

Ade Bentley · Oct 23, 2017

norseman said:
The use of composite gaskets will reduce the compression ratio by (I seem to recall - don't quote me) 0.60, so 9.35 becomes 8.75 if that's of any interest.

Thanks norseman, I knew it would drop the comp, but im not going to be drag racing in the foreseeable future !

Ade Bentley · Oct 23, 2017

Gazbo said:
Timing not effected by head skimming at all, check all your efi/ignition wiring.
Does it have fuel, spark (at the correct time and order), and air, even with valve leakage it should fire up if the ingredients mentioned are present.
You could have efi problems.

YEP, all the above are ok, even the checked both ECU unit & wires, perfik. Still, could be worse, I could have bought a disco.! oops.

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