DONT MOVE THAT CRANK ON THAT OLD ENGINE TILL YOU READ THIS
I thought I should post this Bulletin to avoid so many possible ruined engines with some simple steps................
Hopefully my free advice as a qualified mechanic will be appreciated...........
THERE'S NOT MUCH POINT TO "TURNING OVER" AN OLD ENGINE BY HAND JUST "TO SEE IF IT'S SEIZED" WHICH MAY MEAN YOU'VE JUST CRACKED PERFECTLY GOOD RINGS, AND RIPPED GOOD VALVE SEALS, AND SCORED VALVES IN THEIR GUIDES, PLUS OTHER ENGINE DAMAGE BY DOING SO
NEVER HIT THE KEY FOR THE STARTER TO SHOCK THE BEJUSUS OUT OF THE POOR OLD GIRL........ALWAYS BY HAND FIRST
1/ Worst scenario.........Engine out in weather for 3 months or more with rain water getting in
Procedure........don't even try and turn it over..........complete strip and assessment is the only choice
2/ next best scenario.............as above but no rain or salt spray getting inside motor that hasn't turned over for 12 months or more.......DO NOT MOVE CRANK. read on......
Procedure........rocker covers off and spark plugs out and Timing Cover & Sump off if possible...........if no signs of huge rust and/or damage, spray generous amounts of WD40 or RP7 or similar light lube EVERYWHERE on everything that normally moves......Put at least 2 or 3 tablespoons or more of same light lube inside EACH cylinder.......allow to stand for more than 3 hours........on return repeat above lube of valve gear and cylinders......then place breaker bar and socket on Crank Front Bolt. Attempt GENTLE movement just 1 mm......if crank moves easily, repeat in opposite direction. Then go 2 to 3 mm in orig direction......then back the other way in 3 to 4 mm......keep increasing GRADUALLY in smack increments AS LONG AS IT FEELS FREE, and your observation of valves and rocker gear movements looks normal ...........if there's any tightness or BINDING AT ALL, S T O P ! , and go back to adding MORE LUBE to as many moving parts as possible. Gently lift Valve Guide seals evenly to get lube in, if possible. If you go all the way, before turning crank, loosen off and examine all MAINS and BIGENDS Caps/bearings, using light lube on EVERYTHING as you disassemble carefully. Do not mix up caps and bearings. Mark everything and make sure all items go back where they came from, and renew where necessary.
3/ "not-so-serious-lay-up"..............Follow steps as in PROCEDURE 2/ but may be able to skip Sump and Timing Cover removal
4/ Once all movement is free and full circle and
many hand revs of crank at front bolt has been proven, and plugs are still out, hit the Starter now with a fully charged battery so rapid movement will force out excess lube from plug holes (drape a large cloth over all holes to avoid personal injury and wear safety glasses). Put all items back to normal and start engine with CLEAN NEW OIL IN CRANK-CASE and a new filter THAT HAS BEEN PRIMED BY FILLING WITH AS MUCH NEW OIL AS POSSIBLE.
Hope the above explains how this may save you GRIEF you don't need
Its after midnight now and I'm off to sleep,,,,,,,,,,,,,,,,,,,bye for now.................Bernie
post edited by BEEVEE - 2017/06/14 00:28:39