Service Manual

29
GTS 200
Compression
Remove V alves
1. Place cylinder head on work surface.
2. Remove valve cap from valve stems, Fig. 52.
1
2
Fig. 52 – Removing V alves
1. Valve spring retainer 2. V alve cap
3. With thumbs, press down on valve spring retainer and
spring to compress until lar ge end of slot in retainer can
line up with end of valve stem, Fig. 52.
4. Release pressure on retainer and spring.
5. Remove retainer, spring, and intake valve seal, if removing
intake valve, Fig. 52.
Inspect V alve Guides
1. Measure intake and exhaust valve guides using Briggs &
Stratton T ool #19122.
2. If flat end of gauge can enter guide for 1/4” (6.35mm) or
more, cylinder head must be replaced.
3. If plug gauge is not available, refer to T able No. 1,
Page 32 for reject size.
Valve Service
Reface V alves and Seats
Although valve faces can be resurfaced on a commercially
available valve grinding tool, we do not recommend this
practice as a high quality repair procedure. V alve replacement
is recommended for damaged or worn valves. V alve seats are
cut using Briggs & Stratton T ool #19237 or #19343, Neway
V alve Seat Cutter Kit, to 45 ° on exhaust and some intake
seats. Other intake seats are cut to 30
° . V alve and seat are
lapped in using Briggs & Stratton Tool #19258, V alve Lapping
T ool, and Briggs & Stratton Part #94150, Valve Lapping
Compound, to assure a good seal between the valve face and
the seat.
1. Thoroughly clean lapping compound from valve seat and
valve face.
2. V alve seat width should be as shown in Fig. 53.
1
3
2
45°
4
Fig. 53 – V alve and Seat Dimensions
1. Margin
2. 1/32”
(.79mm) fit for use
3. 1/64” (.38mm) discard
4. V alve seat width minimum
3/64–1/16” (1.17–1.57mm)
3. If s ea t i s w ider , a n arrowin g c utte r s houl d b e u sed. If valve
fac e i s b adl y b urned , t h e b urne d v alv e s houl d b e r eplaced.
4. Replace valve if mar gin is 1/64 inch (.39mm) or less or
damaged, Fig. 53.
If seats are burned or damaged, replace cylinder head.
Assemble Cylinder Head
Install Cylinder Head Plate and
Rocker Arm Studs
1. Place new cylinder plate gasket and cylinder head plate on
cylinder head.
2. Install and torque two (2) cylinder plate screws to
80 in. lbs. (9.0Nm), Fig. 54.
1
Fig. 54 – Installing Cylinder Head Plate
1. Screw: torque to 80 in. lbs. (9.0Nm)