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Old 08-28-2016, 07:01 PM   #1
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Yanmar 6LYA-STP Valve Specs

Reviewing the Yanmar Service manual (Compl Manual in Library section - referenced pages attached)
for a 6LYA-STP in prep for checking / adjusting valves and find 2 different specs noted for exhaust valves.

Pg 10-25 states Valve Clearance 0.1mm intake - 0.4mm exhaust

Pg 10-31-2 and 2-11 states 0.1mm intake - 0.5mm exhaust

Can any of the Yanmar gurus out there shed any light?
Attached Files
File Type: pdf Valve Check Sel Pgs.pdf (141.6 KB, 30 views)
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Old 08-30-2016, 09:02 AM   #2
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Valve Spec Solved

I'll post the answer here just in case others run into this as the Service Manual I referenced is in the TF Library section.

After other responses on BoatDiesel and some digging I think I've figured out what's going on...

​The response got me wondering why the difference in the pg headings​ (Pg 10-25 only lists 6LY2-STE)​...​all others list all 3 Yanmar engine model #'s​

I went back to the full manual and checked the rev history (attached) and that seems to explain what has happened...

Original manual was for the 6LY2-STE only - and the rev added 6LY2A-STP and 6LYA-STP and

Page 10-25 (citing 0.4mm exh was original - ​the​ other pgs (2-11​ & ​10-31​-2)​ ​were​ added and apparently the exhaust clearance spec was changed to 0.5mm

Pg 10-31​-2​ applies to the 6LY2-STE & 6LYA-STE and shows they were revised to the 0.5mm spec w/ the added page​ (and the 6LY2-STE per pg 10-31 was revised to the 0.5mm spec​)

Above seems to support 0.5mm as the correct / latest spec and the 0.4mm on pg 10.25 was missed in the update
Attached Files
File Type: pdf Rev History.pdf (108.3 KB, 15 views)
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