Husqvarna 345 crank movement

BrettS

BrettS

ArboristSite Member
Joined
Feb 14, 2016
Messages
74
Location
Dunedin
Have rebuilt a Husqvarna 345, new seals, bearings etc
I now have quite considerable sideways crank play, I can move the crank sideways in the crankcase, my 350 doesn't do this.
I assume this is not right and how do I go about fixing it?, does this mean I have to replace the bearings or crank?. Can I use some sort of locking compound on the bearings (locktite) to keep them on the crank?.

I also am having trouble keeping it running.
It will fire up on choke and run at fast idle, blip the throttle to bring it down to normal idle and it dies, keep revving the saw and it will run but die after (say) 30 seconds no matter how much throttle input.
I have vacuum/pressure tested for leaks and none found, have pressure/vacuum tested the carb and that proved ok, have fitted new diaphragms/needle etc, have fitted another carb from a running 350 and no change, I have tried various fuel filters, spark plugs, checked fuel lines and have put ultragrey on the inlet manifold (making sure the impulse port wasn't blocked.
Cheers
 
Huskybill

Huskybill

Addicted to ArboristSite
Joined
May 21, 2018
Messages
7,379
Location
Northeast
This has the same upper cylinder adapter as the 350. This adapter is warped on both sides. How long does it hold pressure in the case?
 
BrettS

BrettS

ArboristSite Member
Joined
Feb 14, 2016
Messages
74
Location
Dunedin
This has the same upper cylinder adapter as the 350. This adapter is warped on both sides. How long does it hold pressure in the case?
This model doesn't have the cylinder adapter, the cylinder bolts directly to the plastic crankcase. Before I fitted the cylinder I made sure surfaces were flat and true.
It held pressure as long as I wanted.
 
Huskybill

Huskybill

Addicted to ArboristSite
Joined
May 21, 2018
Messages
7,379
Location
Northeast
I wonder if we an shim the crank to the bearing? Measure the crank with bearing width then measure the crankcase inside width.
 
Clyde85

Clyde85

ArboristSite Operative
Joined
Sep 21, 2020
Messages
468
Location
Smith's Falls On.
The Husqvarna bearings I ended up getting were already seated in the seals and there was about 1/16" to 1/8" of the bearings stuck out past the inner edge of the seals.
 
BrettS

BrettS

ArboristSite Member
Joined
Feb 14, 2016
Messages
74
Location
Dunedin
The Husqvarna bearings I ended up getting were already seated in the seals and there was about 1/16" to 1/8" of the bearings stuck out past the inner edge of the seals.
That's pretty much what I have done, stripped the saw down again and adjusted the bearings in the seals to suit and now have the crank snug in the case.
 
BrettS

BrettS

ArboristSite Member
Joined
Feb 14, 2016
Messages
74
Location
Dunedin
Thought I best update
As per my comment above I readjusted the bearings in the seals and had a snug fitting crank (thanks to Clyde85).
Put everything together and it still didn't run/well.
I re went over everything I did and noticed cracking in the fuel line (that I missed before) as I was refitting the line to the carb.
AHA i found the problem!, snipped off the offending part and fitted the line to the carb and the saw RUN, and with some minor adjustments it run well.
The customer is happy with it, they wanted a smaller bar/chain fitted so fitted a 16" bar/chain for them.
So all in all I should have checked the fuel line first....
 

Latest posts

Top