plastigauge sizes for main and rod??? - GT-R Register - Official Nissan Skyline and GTR Owners Club forum

NickGTS · 1st August 2008, 03:16 AM

starting to rebuild my rb26dett, crank has been done and is standard bearing size, does any one know which size gauges i need?

if i stab in the dark it's 0.020/0.039mm clearance so the plastigauge is should use is 0.018/0.045mm??? like ebay item 310071473399

could really use some help

gibson · 1st August 2008, 07:30 AM

the 18 to 45 would be fine clearance on the mains is 0.028/0.046 and rods is grade 1 0.020/0.040

hope this helps

shanef · 9th August 2008, 11:01 AM

id never use plastigauge to measure clearances - unless it was grannys 1.4l festiva

seriously, buy a decent set of micrometers or let someone else do it

kismetcapitan · 9th August 2008, 03:20 PM

or do what my builder did and use both micrometers and plastigage.

He used 0.038mm clearances on both crank and rods, and went to great lengths to fit the bearings to those exact clearances.

SamuraiSam · 9th August 2008, 03:31 PM

If you mic it, you don't need to plastigauge it. Plastigauge is way inaccurate compared to micrometer measurements.

UKPAISLEY · 9th August 2008, 06:35 PM

Not many people have internal micrometer to do that job, I have, but would norm use plastic on shell bearings, would use mic on the shafts.

steveyturbo · 9th August 2008, 06:59 PM

dial bore guage and micrometer is the only way to measure it accurately

UKPAISLEY · 9th August 2008, 07:10 PM

I am in luck i have about 5 dif sets I can use from work, (As long as I bring them back :-) but it is complicated and easy to make a hash of it. I have to change range fittings for the internal stuff, and mic the internal guage with the external one as a calibration. all our stuff is checked every 3 months , I am about to build my own engine , I will use mic as realy the plastic is only a guide but its better than nothing. RB engines are highly stressed , as somone else has said its not an uncle Festa!

cokey · 10th August 2008, 12:57 AM

Quote:

Originally Posted by UKPAISLEY

I am in luck i have about 5 dif sets I can use from work, (As long as I bring them back :-) but it is complicated and easy to make a hash of it. I have to change range fittings for the internal stuff, and mic the internal guage with the external one as a calibration. all our stuff is checked every 3 months , I am about to build my own engine , I will use mic as realy the plastic is only a guide but its better than nothing. RB engines are highly stressed , as somone else has said its not an uncle Festa!

Brilliant, can I borrow a magnetic mount dial gauge for the evening ? can pick up and return same day !
cheers cokey

SamuraiSam · 10th August 2008, 07:16 PM

I would never let precision measuring tools out of my own sight, and would probably prefer to measure myself. Drop them once, and you have to have them sent out and calibrated. Starrett mics and inside bore gauges are extremely expensive. You do not need a dial gauge to measure main or rod journals, just a set of mics.

UKPAISLEY · 10th August 2008, 07:18 PM

While we are talk about measuring, any ideas who to send my crank to for inspection ?

1st August 2008, 03:16 AM	#1 (permalink)
NickGTS GTR Register Member Join Date: Apr 2006 Posts: 24	plastigauge sizes for main and rod??? starting to rebuild my rb26dett, crank has been done and is standard bearing size, does any one know which size gauges i need? if i stab in the dark it's 0.020/0.039mm clearance so the plastigauge is should use is 0.018/0.045mm??? like ebay item 310071473399 could really use some help

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1st August 2008, 07:30 AM	#2 (permalink)
gibson GTR Register Member Join Date: Feb 2005 Location: hertfordshire Posts: 430	the 18 to 45 would be fine clearance on the mains is 0.028/0.046 and rods is grade 1 0.020/0.040 hope this helps

9th August 2008, 11:01 AM	#3 (permalink)
shanef GTR Register Member Join Date: Jun 2006 Posts: 207	id never use plastigauge to measure clearances - unless it was grannys 1.4l festiva seriously, buy a decent set of micrometers or let someone else do it

9th August 2008, 03:20 PM	#4 (permalink)
kismetcapitan GTR Register Member Join Date: Nov 2005 Location: Seoul Korea Posts: 6,402	or do what my builder did and use both micrometers and plastigage. He used 0.038mm clearances on both crank and rods, and went to great lengths to fit the bearings to those exact clearances.

9th August 2008, 03:31 PM	#5 (permalink)
SamuraiSam GTR Register Member Join Date: Oct 2007 Posts: 390	If you mic it, you don't need to plastigauge it. Plastigauge is way inaccurate compared to micrometer measurements.

9th August 2008, 06:35 PM	#6 (permalink)
UKPAISLEY GTR Register Member Join Date: Jan 2003 Location: NORTH EAST Posts: 292	Not many people have internal micrometer to do that job, I have, but would norm use plastic on shell bearings, would use mic on the shafts.

9th August 2008, 06:59 PM	#7 (permalink)
steveyturbo GTR Register Member Join Date: Dec 2006 Posts: 181	dial bore guage and micrometer is the only way to measure it accurately

9th August 2008, 07:10 PM	#8 (permalink)
UKPAISLEY GTR Register Member Join Date: Jan 2003 Location: NORTH EAST Posts: 292	I am in luck i have about 5 dif sets I can use from work, (As long as I bring them back :-) but it is complicated and easy to make a hash of it. I have to change range fittings for the internal stuff, and mic the internal guage with the external one as a calibration. all our stuff is checked every 3 months , I am about to build my own engine , I will use mic as realy the plastic is only a guide but its better than nothing. RB engines are highly stressed , as somone else has said its not an uncle Festa!

10th August 2008, 07:16 PM	#10 (permalink)
SamuraiSam GTR Register Member Join Date: Oct 2007 Posts: 390	I would never let precision measuring tools out of my own sight, and would probably prefer to measure myself. Drop them once, and you have to have them sent out and calibrated. Starrett mics and inside bore gauges are extremely expensive. You do not need a dial gauge to measure main or rod journals, just a set of mics.

10th August 2008, 07:18 PM	#11 (permalink)
UKPAISLEY GTR Register Member Join Date: Jan 2003 Location: NORTH EAST Posts: 292	While we are talk about measuring, any ideas who to send my crank to for inspection ?