3.24
ENGINE
9923412 - 2012 Sportsman 400/500 and EFI Tractor Service Manual
© Copyright 2011 Polaris Sales Inc.
Cylinder Head Inspection
Thoroughly clean cylinder head (B) surface to remove all
traces of gasket material and carbon.
CAUTION: Use care not to damage sealing surface.
Cylinder Head Warpage
Lay a straight edge across the surface of the cylinder head
at several different points and measure warpage by
inserting a feeler gauge between the straight edge and the
cylinder head surface. If warpage exceeds the service
limit, replace the cylinder head.
Cylinder Head Disassembly
NOTE: Keep all parts in order with respect to their
location in the cylinder head.
1. Using a valve spring compressor (C), compress the
valve spring and remove the split keeper.
NOTE: To prevent loss of tension, do not compress
the valve spring more than necessary.
2. Remove spring retainer and spring.
NOTE: The valve springs should be positioned with
the tightly wound coils against the cylinder head on
progressively wound springs (D).
3. Push valve out, keeping it in order for reassembly in
the same guide.
Cylinder Head Warpage Limit:
.002” (.05 mm)
Wear eye protection or a face shield during
cylinder head disassembly and reassembly.
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