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Front engine mounts removal |
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Wilhelm Hertzog 
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Joined: June-14-2014 Location: Cape Town Status: Offline Points: 334 |
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 Topic: Front engine mounts removalPosted: November-02-2021 at 7:30am |
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My front engine mounts will need to be cleaned up or replaced in the not too distant future. Can they be removed with the same 'bottle jacks under the manifolds and pivot on the trunnion' method as the rear transmission mounts are typically removed, or is it not as simple as that?
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1982 Ski Nautique PCM351W RR II Velvet Drive 10-17-003 1:1 II PerfectPass Stargazer
Do not go gentle into that good night. Rage, rage against the dying of the light. |
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MourningWood
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Joined: June-13-2014 Location: NorCal Status: Offline Points: 915 |
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Posted: November-02-2021 at 10:26am |
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To me, having never used the 'bottle jack' approach, I can only suspect that there is much more weight carried by the front mounts than the rears.
For that reason taking the weight off the mounts from overhead would seem a better way to go. Can you lift the motor by the 2 lifting rings?
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1964 Dunphy X-55 "One 'N Dun"
'I measured twice, cut three times, and it's still too short!" |
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Wilhelm Hertzog
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Joined: June-14-2014 Location: Cape Town Status: Offline Points: 334 |
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Posted: November-04-2021 at 3:06pm |
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I don't have ready access to a hoist or crane to lift the engine from overhead, hence investigating the bottle jack method. Bottle jacks worked really well for getting the transmission out of my boat recently - I'm hoping it is an option for the front mounts as well.
Anyone else who can weigh in on this? |
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1982 Ski Nautique PCM351W RR II Velvet Drive 10-17-003 1:1 II PerfectPass Stargazer
Do not go gentle into that good night. Rage, rage against the dying of the light. |
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KENO
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Joined: June-06-2004 Location: United States Status: Offline Points: 11090 |
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Posted: November-04-2021 at 3:25pm |
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I don't see why it wouldn't work.
The bottle jack should have no problem with the weight involved and you can slide wooden blocking under the harmonic balancer/oil pan just in case. You won't have a ton of jacking movement before the transmission and the bilge are in contact with each other, but it should be enough to get the mounts off. You'll need to find a spot where the jack won't slip which might be trickier than jacking from the rear.
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MourningWood
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Joined: June-13-2014 Location: NorCal Status: Offline Points: 915 |
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Posted: November-04-2021 at 9:48pm |
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I guess I'm thinking of the floor or wherever the jack is placed....
In any case, a tree or a beam in a garage would be adequate...you're only asking it to support a portion of the total drivetrain weight. You could use a 5000 lb. automotive ratcheting tie-down to get the weight off the mounts. Then unbolt from the stringers and from the engine block........
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1964 Dunphy X-55 "One 'N Dun"
'I measured twice, cut three times, and it's still too short!" |
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Wilhelm Hertzog
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Joined: June-14-2014 Location: Cape Town Status: Offline Points: 334 |
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Posted: November-05-2021 at 2:50am |
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Thanks for the input guys. Definitely will be using wooden blocking in all kinds of places to make sure disaster doesn't strike (as I did with the transmission removal). I'll probably only get round to this in a few months' time, but just wanted to establish if it is feasible and what to look out for.
My garage roof is a concrete slab (there is a patio on top). If this kind of job becomes a regular occurrence, I may well consider installing something to facilitate lifting the engine out of the boat.
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1982 Ski Nautique PCM351W RR II Velvet Drive 10-17-003 1:1 II PerfectPass Stargazer
Do not go gentle into that good night. Rage, rage against the dying of the light. |
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GottaSki
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Joined: April-21-2005 Location: NE CT Status: Offline Points: 3363 |
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Posted: November-05-2021 at 4:00am |
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You likely already thought of this, but I would loosten the bolts at the output flange also, so if things move , as you work, the shaft doesn't get torqued around
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"There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing."
River Rat to Mole |
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KENO
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Joined: June-06-2004 Location: United States Status: Offline Points: 11090 |
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Posted: November-05-2021 at 8:24am |
You could build yourself one of these wooden "thingies" and lift the front of the engine with a come a long or whatever. I'd call it some more technical term, but then along would come a few people to disagree about what it technically is. Maybe you can get some more construction ideas from the old thread in the link below You could even make a little miniature version to fit inside on the floor of the boat
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Gary S
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Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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Posted: November-05-2021 at 9:50am |
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Personally I use the natural environmentally sound method. Of course you have to pick your day carefully. Notice that 17 years later from the picture in Ken's link, still fully operational - raking leaves and minor pruning required for maintenance.
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ultrarunner
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Joined: October-02-2005 Location: Ridgefield, Ct. Status: Offline Points: 1842 |
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Posted: November-06-2021 at 3:18pm |
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You could easily install a concrete anchor in the ceiling and use a come-a-long on that anchor, to ratchet up the engine.
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