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[email protected] jlove5396@yahoo.com is offline
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First recorded activity by BoatBanter: Mar 2008
Posts: 5
Default 1986 170hp mer cruiser not getn any fire

On Mar 29, 6:57*pm, Brian Whatcott wrote:
On Wed, 26 Mar 2008 10:08:08 -0700 (PDT), wrote:
anyone had this problem before,or can you help me out anyway


Cheap preliminaries.

Pull one plug. Hook it tback o the lead and rest it on the block.
Crank. * Look for the spark at the plug. A blue spark.
Look for a repeated blue spark. If yes, the ignition is not the
problem.

Squirt a good dose of ether in the inlet and crank.
look for a firing cylinder or two. If not, the fuel is not a problem.

If spark but no firing cylinder with ether, then fuel is
not the issue *and spark is not the issue.

Test compression in a plug hole. If over 100 psi, then
compression is not the problem.

If you earlier saw a repeated spark, then the timing chain is usually
OK cause it usually drives the camshaft which drives the distributor
which times the spark.

So now you are left with timing.
*Get a timing light - $30 for preference. The timing chain may have
slipped a tooth or three

There you go!

Brian Whatcott * *Altus OK


I FOUND THE PROBLEM ... THERE IS A LIMIT SWITCH ON THE SIDE OF THE
MOTOR THAT WAS BAD ...I UNBOLTED IT FROM THE MOTOR LEFT IT
HANGING,STILL WIRED IN THE CIRCUIT,BUT THE ARM WAS NOT PUSHED IN,SO
THEREFOR IT FIRED...WHEN THE ARM WAS PUSHED IN THE MOTOR WOULD NOT
FIRE OFF,...I HAVE NO IDEA WHAT IT IS FOR BUT IT SEEMED TO FIX THE
PROBLEM