Wisconsin VH4D Dokumentacja Pobierz pdf (Strona 22)

Loose or burnt out connecting rod bearing.

Engine overheated due to causes under previous

heading.

Worn or loose piston pin.

ENGINE BACKFIRES THROUGH CARBURETOR

Water or dirt in gasoline.

Engine cold.

Poor grade of gasoline.

Sticky inlet valves. See ’Valves’, Page 22.

Overheated valves.

Spark plugs too hot. See ’Spark Plug’, Page 15.

Hot carbon particles in engine.

DISASSEMBLY AND REASSEMBLY

OF VH4D ENGINE

Engine re, pairs should be made only by a mechanic

who has had experience in such work. When disassem-

bling the engine, it is advisable to have several boxes

available so that parts belonging to certain groups

can be kept together, such as, for instance, the cyl-

inder head screws, etc. Capscrews of various lengths

are used in the engine, therefore great care must be

exercised in reassembly so the right screw will be

used in the various places, otherwise damage may

result.

Tighten the capscrews and nuts of the manifolds,

cylinder heads, gear cover, oil pan, connecting rods,

cylinder blocks, main bearing plate and the spark

plugs to the specified torque readings indicated in

the following paragraphs of reassembly.

While the engine is partly or fully dismantled, all of

the parts should be thoroughly cleaned. Remove all

accumulated dirt between the fins.

If it is desired to disassemble the engine, the follow-

ing order should be substantially adhered to. As dis-

assembly progresses, the order may be altered some-

what if desired, as will be self-evident to the me-

chanic. Reassembly of the engine should be made in

the reverse order.

TESTING REBUILT ENGINE

Proper break-in will lead to trouble-free operation and

increased engine life. The factory test given to a new

engine is not sufficient to establish the polished bearing

surfaces which are so necessary for good performance

and long engine life. There is no quick way to force the

establishment of good bearing surfaces, and these can

only be obtained by running a new engine carefully and

under reduced speeds and loads for a short period of

time. Run the engine for a half hour without load at low

idle speed (1000 to 1200 R.P.M.). The speed should

then be increased gradually, to engine operating r.p.m.

still without load, for an additional two hours. If at all

possible, operate the engine at light loads for a period

totaling about eight hours, before maximum load is

applied.

ACCESSORIES

The air cleaner, oil filter, magneto, and if an electric

starter and generator are used, these should be re-

moved first.

Remove clutch or clutch reduction unit if engine is

equipped with either of these accessories.

SHEET METAL HOUSE

On power units, remove the muffler and canopy first.

Disconnect air cleaner, choke, governor control and

instrument wires at the front house panel. The front

panel can be removed as part of the flywheel shroud,

as explained in the following paragraphs of dis-

assembly.

FLYWHEEL

After the flywheel screen has been removed, drive

out the starting crank pin in the crankshaft and re-

move the flywheel nut and washer.

The flywheel is mounted to a taper on the crankshaft.

Take a firm hold on the flywheel fins, pull outward

and at the same time strike the end of the crankshaft

with a babbitt hammer, see Fig. 18. The flywheel

will slide off the taper of the crankshaft. Do not use

a hard hammer as it may ruin the crankshaft and bear-

ings. When reassembling the flywheel, be sure the

Woodruff key is in position on the shaft and that the

keyway in the flywheel is lined up accurately with

the key.

AIR SHROUDING

To disassemble air shrouding, refer to Fig. 19. First

remove cylinder head covers and the screws mount-

Fig. 18

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 47 48

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Wisconsin VH4D Dokumentacja Strona 22

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