• Husqvarna Motorcycles Made In Sweden - About 1988 and older

  • Hi everyone,

    As you all know, Coffee (Dean) passed away a couple of years ago. I am Dean's ex-wife's husband and happen to have spent my career in tech. Over the years, I occasionally helped Dean with various tech issues.

    When he passed, I worked with his kids to gather the necessary credentials to keep this site running. Since then (and for however long they worked with Coffee), Woodschick and Dirtdame have been maintaining the site and covering the costs. Without their hard work and financial support, CafeHusky would have been lost.

    Over the past couple of weeks, I’ve been working to migrate the site to a free cloud compute instance so that Woodschick and Dirtdame no longer have to fund it. At the same time, I’ve updated the site to a current version of XenForo (the discussion software it runs on). The previous version was outdated and no longer supported.

    Unfortunately, the new software version doesn’t support importing the old site’s styles, so for now, you’ll see the XenForo default style. This may change over time.

    Coffee didn’t document the work he did on the site, so I’ve been digging through the old setup to understand how everything was running. There may still be things I’ve missed. One known issue is that email functionality is not yet working on the new site, but I hope to resolve this over time.

    Thanks for your patience and support!

Four Stroke Crank Dimensions

PEZBerq

PEZBerq

Husqvarna
AA Class
I need the specs for the crank for my 87 510 TE four stroke. Can someone tell me what the spec is for the crank width between the webs. I can't find it in my workshop manual. Two stroke manual says 58 mm but what is the 4 stroke spec? Thanks Steve
 
The reason I ask is that my crank has been pressed with the webs not flush with the crank pin (unlike 2 strokes which are pressed so crank pin width equals width across the outer face if the webs/flywheels. The pin is recessed by 0.7 mm which is equal to the thrust washer thickness. Overall width across webs is 61.5 mm which seems wrong to me. I only discovered this issue when I couldn't assemble the bottom end without the crank binding as I tightened the case screws up. It looks like the crank is too wide and the cases are flexing about the crank bearings and causing the bearings to bind. Has anyone experienced this? It would explain why a super thick center gasket was used on this engine! Confirmation of factory spec for width of assembled crank across the webs would be a big help. Thanks
 
Couldn't you measure the depth of each case half, plus the gasket thickness to determine crank width?
We have to do that with the old Sachs motors to set the main bearing tolerances.
 
Ive never built a 87 LC 4T engine but quite a few AC 83-86 race engines.

On the original AC conrods, there were no thrustwashers. Some of the original later rods, bronze coloured, i sourced had the elephant (Cagiva) casting in the rod and still no thrustwashers with rodkit, and I assume these were from 87 and later.

One of my last batch engines was built with a EuroRods kit that came with copper coated thrustwashers, and I had similar spacing issues with them thrust washers installed. I split the crank again, removed thrustwashers, pressed cranklobes flush with pin 58mm, installed the original steel collar washers on both crankpins, and assembled engine with 0,8mm gasketing pre-soaked in oil. Viola and that engine is doing its 3rd hellbent season at present with only the valvelash ever adjusted once.
 
Thanks for the replies and info. My rod is a Cagiva and was installed with the thrust washers fitted. It has a thick gasket but still binds when the cases are tightened up. I will get the crank split and rebuilt minus the washers. As a check I will measure the bearing spacing on the cases and check against the crank width if pressed flush with the ends of the crank pin. My crank pin is 60 mm wide - not 58 mm so I assume the 4 strokes are different to the two strokes in this respect. They use different cases so I guess that's why the difference. Again thanks for the info - what a great website this is!
 
You must log in or register to reply here.
Back
Top