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Old 14 May 2019, 15:46   #1
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Seized engine transom bolts

Hi all

Some technical wisdom needed please. I have an 8hp Yamaha outboard, the tightening transom bolts are very very tight, one moves with allot of persuasion and the other I canít get to budge at all. Any suggestions?

Thanks! Click image for larger version

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Old 14 May 2019, 17:26   #2
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Obviously penetrating oil over a period of time, boiling water can also work
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Old 14 May 2019, 17:58   #3
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Plus Gas is a very good penetrating release oil. Incidentally, the hand screws, get a monkey wrench on the end, but not the extended swivel part of the handle, nearer the screw thread end and lever from there.
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Old 15 May 2019, 02:28   #4
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Thanks both, Iíll give that a try tonight

Also do any of you by any chance know what the item in the image is, itís loose so cannot are what itís purpose is but from the parts diagram, it seems to be labelled as a tilt lock ... Click image for larger version

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Old 15 May 2019, 05:40   #5
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failing that heat blow lamp
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Old 15 May 2019, 10:22   #6
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Be careful if using a wrench on the nuts. I have a johnson 4.5 with 2 sheared threads which is in need of repair where I was over enthusiastic with one. They snapped very easily and are a bugger to drill out too.

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Old 15 May 2019, 10:27   #7
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Be careful if using a wrench on the nuts. I have a johnson 4.5 with 2 sheared threads which is in need of repair where I was over enthusiastic with one. They snapped very easily and are a bugger to drill out too.

Phil M


Yeah I was thinking about that. Maybe a blow torch to soften, once loose Iíll put some grease on it! Iíll give it another go tonight
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Old 15 May 2019, 11:10   #8
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only heat the steel part not the ali
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Old 15 May 2019, 17:11   #9
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So what worked was:

Knocked out the pin which holds the plastic lever on, took plastic lever off. Got a long adjustable wrench and levered, working it bit by bit while spraying GT85, as it worked around the thread whatever was seizing it worked loose and both now loosen and tighten perfectly.
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Old 16 May 2019, 01:26   #10
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Part above looks like tilt lock which will support it in a raised position
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Old 16 May 2019, 01:57   #11
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Part above looks like tilt lock which will support it in a raised position


Yes it was, took out a rod (forget the name) that goes through the tilt lock and spun round the plastic tilt lock as it hasnít been reconnected when the water filter was replaced - Thanks!
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