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  #16  
Old 11-06-2015, 02:16 PM
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Originally Posted by jonbills View Post
£1000 engineering work - skimming & boring block, skimming head, measuring up for boring, cleaning everything properly, baffling the sump a bit better, helicoiling the cam tower etc
Cheap !
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  #17  
Old 11-06-2015, 03:26 PM
SKiddell SKiddell is offline
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Cheap !
Yes indeed, I do know that Jon has paid considerable attention to the fine detail of clearances and alignements. I hope it pulls like a train Jon, given the effort you have put in.
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  #18  
Old 12-06-2015, 09:44 AM
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So far so good! A number of people have helped a lot with advice. It's idling nicely now, and no oil leaks which is a relief.
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  #19  
Old 12-06-2015, 10:00 AM
Geoff-R Geoff-R is offline
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Cracking work and money well spent!
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  #20  
Old 12-06-2015, 10:22 AM
atomman atomman is offline
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Looks lovely,

can I ask why they heli-coiled the cam towers ? did you strip a thread or was it just an update for more strength ?

I remember I heli-coiled my old porsche super 9 case because the heads studs tended to pull out,
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  #21  
Old 12-06-2015, 10:42 AM
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Rob Gaskin Rob Gaskin is offline
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Quote:
Originally Posted by jonbills View Post
....- last weekend I f****d up the cam tower threads by following the pictures in 'how to rebuild your nissan OHC' and torqued them to 33ft-lb
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...........can I ask why they heli-coiled the cam towers ? did you strip a thread or was it just an update for more strength ?
Sometimes gut-feeling is a good idea with bolts (awaits Skid's response )
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  #22  
Old 12-06-2015, 11:45 AM
atomman atomman is offline
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good to know !

Lucky I've got that book to !

yeah i'm with Skid's on that one
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  #23  
Old 12-06-2015, 07:01 PM
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Sometimes gut-feeling is a good idea with bolts (awaits Skid's response )
My point being that if it's a small bolt into aluminium then you don't need a high torque so double check if the figure seems excessive. I don't mean tighten it to two slips of the Stilsons!

Obviously torgue is critical on some components e.g. stretch cylinder head bolts.
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  #24  
Old 06-07-2015, 09:18 PM
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A small update -
I've decided 89mm gaskets don't go well with 88.5mm bore engines :-(
I had a significant amount of pinking, so I just took the head off and this is what I found:

Not sure if you can see it properly - the thing that looks like a thread there is a strip of the metal sealing ring. Looks like the pistons have been hitting it and the metal seals are worn through on at least 3 cylinders. I guess the dowels don't locate it well enough with only 0.25 mm of clearance.

No harm done I think, and I've got a nice new 1.5 mm thick Kameari gasket to go on, that has 1mm clearance all the way round.

Another junior engine builder error
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Last edited by jonbills; 24-08-2017 at 10:34 AM..
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  #25  
Old 06-07-2015, 09:18 PM
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SeanDezart SeanDezart is offline
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Can't see the photo mate.
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  #26  
Old 06-07-2015, 09:22 PM
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Look closely
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  #27  
Old 06-07-2015, 10:27 PM
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Quote:
Originally Posted by SeanDezart View Post
Can't see the photo mate.
Quote:
Originally Posted by jonbills View Post
Look closely


He means he can't see the photo.
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  #28  
Old 06-07-2015, 10:33 PM
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SeanDezart SeanDezart is offline
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Yep - I know my eyes are sh*t but no image is asking too much.
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  #29  
Old 07-07-2015, 08:41 AM
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I can see the image - can anyone else?
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  #30  
Old 07-07-2015, 08:44 AM
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Rob Gaskin Rob Gaskin is offline
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I can see the image - can anyone else?
Yes - Sean often can't see things e.g. ebay items.
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