Plastigauge Clearances On Mi16

[Dave_McC 0]

I'm finally reassembling my Mi16 having had the crank reground, and with new bearings. I've plastigauged the bearings and have measured 3 thou on the mains and 2 thou on the big ends.

 

Does this sound ok? Haynes doesn't seem to quote what they should be and I can't find them on here.

 

Cheers

 

Dave

[marksorrento205 80]

I asked this question to a firm near me who rebuild engines esp. aston martins and he said 2 - 2.5 thou. However martin at prd said even smaller. When I fitted standard shells to my mi I had 2 - 2.5 and it sounds ok with good oil pressure.

[Dave_McC 0]

Cheers

 

I checked with Matt at QEP when I was down there last week picking up some bits - as a rule of thumb he said 1 thou clearance per inch journal size - so should ideally be nearer 2 than 3 thou for both mains and big ends, but 3 thou for the mains would be ok.

 

Dave

[marksorrento205 80]

Sweet, thats a handy tip to know!!

[fletch 0]

I asked the same question last week and got that response which put my mind at ease when I was deliberating over 0.01mm!

[silent_running 0]

I asked the same question last week and got that response which put my mind at ease when I was deliberating over 0.01mm!

 

I'm just doing mine on my Subaru EJ20 and the clearance limit on the mains is 0.035mm, which is what, nearer 1 thou than 2? The actual recommended clearance is definitely around 1 thou. How that relates to other cars though I don't know.

[fletch 0]

Thats just over 1 thou yes.

[Dave_McC 0]

and scooby engines are sensitive to the big end bearings - spinning No.3 from memory usually just after an oil change - I had one for 6 years - loved it but paranoid every time the oil was changed.

 

Dave