{"id":7531,"date":"2026-01-28T18:05:01","date_gmt":"2026-01-28T17:05:01","guid":{"rendered":"http:\/\/www.railway-models-and-art.co.uk\/blog\/?p=7531"},"modified":"2026-01-28T18:05:01","modified_gmt":"2026-01-28T17:05:01","slug":"mok-8f-8425-chassis-problem-not-what-i-thought","status":"publish","type":"post","link":"http:\/\/www.railway-models-and-art.co.uk\/blog\/?p=7531","title":{"rendered":"MOK 8F 8425 &#8211; Chassis Problem Not What I thought"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Well, that proved interesting. I removed the two offending driving wheel springs and I confess that I was surprised when that didn\u2019t fix anything. The restricted movement still remained, so further investigation was required.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Looking a bit closer revealed that the problem was being caused by the compensation beam hitting part of the ashpan\/gearbox housing arrangement.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><a href=\"http:\/\/www.railway-models-and-art.co.uk\/blog\/wp-content\/uploads\/2026\/01\/Ashpan-Issue-Copy.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"890\" height=\"918\" src=\"http:\/\/www.railway-models-and-art.co.uk\/blog\/wp-content\/uploads\/2026\/01\/Ashpan-Issue-Copy.jpg\" alt=\"\" class=\"wp-image-7532\" srcset=\"http:\/\/www.railway-models-and-art.co.uk\/blog\/wp-content\/uploads\/2026\/01\/Ashpan-Issue-Copy.jpg 890w, http:\/\/www.railway-models-and-art.co.uk\/blog\/wp-content\/uploads\/2026\/01\/Ashpan-Issue-Copy-291x300.jpg 291w, http:\/\/www.railway-models-and-art.co.uk\/blog\/wp-content\/uploads\/2026\/01\/Ashpan-Issue-Copy-768x792.jpg 768w\" sizes=\"auto, (max-width: 890px) 100vw, 890px\" \/><\/a><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Once I worked out the issue my first thought was how the devil do I get in there to cut out some material to allow more movement. I couldn\u2019t see how I might get a piercing saw in&nbsp;and although I do have a shallow bladed razor saw, that was too deep to go in. The last resort saw wise, was to try a hacksaw blade. That too wouldn\u2019t fit. Then I realised that if I&nbsp;unscrewed the motor retaining ring it might be possible to get a milling cutter in.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">I gripped the chassis in the mill vice and with a 2mm two flute slot drill I carefully milled out a slot either side taking care just to go through the two layers of etch without hitting the&nbsp;compensation beam.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"http:\/\/www.railway-models-and-art.co.uk\/blog\/wp-content\/uploads\/2026\/01\/Relief-Slots-Milled.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"879\" src=\"http:\/\/www.railway-models-and-art.co.uk\/blog\/wp-content\/uploads\/2026\/01\/Relief-Slots-Milled-1024x879.jpg\" alt=\"\" class=\"wp-image-7533\" srcset=\"http:\/\/www.railway-models-and-art.co.uk\/blog\/wp-content\/uploads\/2026\/01\/Relief-Slots-Milled-1024x879.jpg 1024w, http:\/\/www.railway-models-and-art.co.uk\/blog\/wp-content\/uploads\/2026\/01\/Relief-Slots-Milled-300x258.jpg 300w, http:\/\/www.railway-models-and-art.co.uk\/blog\/wp-content\/uploads\/2026\/01\/Relief-Slots-Milled-768x659.jpg 768w, http:\/\/www.railway-models-and-art.co.uk\/blog\/wp-content\/uploads\/2026\/01\/Relief-Slots-Milled-349x300.jpg 349w, http:\/\/www.railway-models-and-art.co.uk\/blog\/wp-content\/uploads\/2026\/01\/Relief-Slots-Milled.jpg 1061w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Now I just need to refit the spring castings<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Well, that proved interesting. I removed the two offending driving wheel springs and I confess that I was surprised when that didn\u2019t fix anything. The restricted movement still remained, so further investigation was required. Looking a bit closer revealed that &hellip; <a href=\"http:\/\/www.railway-models-and-art.co.uk\/blog\/?p=7531\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[6],"tags":[],"class_list":["post-7531","post","type-post","status-publish","format-standard","hentry","category-mok-8f"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"http:\/\/www.railway-models-and-art.co.uk\/blog\/index.php?rest_route=\/wp\/v2\/posts\/7531","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.railway-models-and-art.co.uk\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.railway-models-and-art.co.uk\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.railway-models-and-art.co.uk\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.railway-models-and-art.co.uk\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=7531"}],"version-history":[{"count":1,"href":"http:\/\/www.railway-models-and-art.co.uk\/blog\/index.php?rest_route=\/wp\/v2\/posts\/7531\/revisions"}],"predecessor-version":[{"id":7534,"href":"http:\/\/www.railway-models-and-art.co.uk\/blog\/index.php?rest_route=\/wp\/v2\/posts\/7531\/revisions\/7534"}],"wp:attachment":[{"href":"http:\/\/www.railway-models-and-art.co.uk\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=7531"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.railway-models-and-art.co.uk\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7531"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.railway-models-and-art.co.uk\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7531"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}