{"id":2720,"date":"2026-10-26T16:20:46","date_gmt":"2026-10-26T15:20:46","guid":{"rendered":"https:\/\/www.ludwig-hunger.de\/product-ranges\/marine\/boring-out-valve-seat-ring-bores\/"},"modified":"2026-11-13T09:12:30","modified_gmt":"2026-11-13T08:12:30","slug":"boring-out-valve-seat-ring-bores","status":"publish","type":"page","link":"https:\/\/www.ludwig-hunger.de\/en\/product-ranges\/marine\/boring-out-valve-seat-ring-bores\/","title":{"rendered":"Boring Seat Ring Holes"},"content":{"rendered":"\t\t
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\n\t\t\t\t\t\t\n\t\t\t\t\t\t\tBoring Seat Ring Holes\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/h2>\n\t\t\t\t\n\t\t\t\t\n\t\t\t<\/div>\n\t\t\t\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\n<\/div>\n
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Home<\/a> \/<\/span> Page<\/span><\/div>\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\n<\/div>\n\n<\/div>\n\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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VD4HD-ADM Boring Machine\n<\/h2>\t\t\t\t<\/div>\n\t\t
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Application:<\/h3>

The VD4HD-ADM boring machine is designed to bore out valve seat ring bores in cylinder heads for the installation of oversize seat rings.<\/p>

Operating Principle:<\/h3>

The standard bore is progressively bored out from top to bottom with a fine feed rate to the preset diameter. The exact feed path is governed by a precision guide mounted directly on the machine’s gearbox head. The valve seat bore is bored out smoothly and to precise tolerances for installing the oversize seat ring.<\/p>

Features:<\/h3>

The drive unit of the VD4HD-ADM is identical to the drive unit of the VD4HD<\/span><\/a> valve seat turning machine and is therefore only required if a VD4HD is not already available.Instead of the seat machining gearhead, a boring gearhead is bolted onto the drive unit.Two different boring gearheads are available.The AV boring head is equipped exclusively with a vertical feed unit, while the AVH boring head features an additional horizontal feed unit.Boring is performed using a fine-turning tool equipped with a micrometer scale for precise adjustment of the boring diameter.<\/p>

Form-boring tools are available for machining a beveled step for the secure installation of O-rings.A slip clutch integrated into the gearhead disengages the feed as soon as the tool tip reaches the bottom of the bore.<\/p>

Thanks to its compact design, the VD4HD-ADM can be used both in the workshop and on site.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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Technical Data:<\/span><\/td>\n<\/td>\n<\/tr>\n
Operating range:<\/b><\/td>\n<\/td>\n<\/tr>\n
Valve Machining<\/b><\/td>\n<\/tr>\n
Valves with stem diameter<\/td>\n16 \u2013 37 mm<\/td>\n<\/tr>\n
Valves with seat diameter<\/td>\n60 \u2013 230 mm<\/td>\n<\/tr>\n
Valves with seat angle<\/td>\n45\u00b0 \u2013 20\u00b0<\/td>\n<\/tr>\n
Valves with minimum length<\/td>\n> 400 mm<\/td>\n<\/tr>\n
Valve Seat Machining<\/b><\/td>\n<\/tr>\n
Valve seats with diameter<\/td>\n60 \u2013 230 mm<\/td>\n<\/tr>\n
Valve seats with seat angle<\/td>\n19.5\u00b0 \u2013 45\u00b0<\/td>\n<\/tr>\n
For more information, please refer to our catalog\/brochure<\/sub><\/td>\n<\/tr>\n
Feed:<\/b><\/td>\n<\/td>\n<\/tr>\n
Speed range<\/td>\n120 \u2013 350 rpm<\/td>\n<\/tr>\n
Facing feed<\/td>\n0.12 mm\/rev<\/td>\n<\/tr>\n
Electrical equipment:<\/b><\/td>\n<\/td>\n<\/tr>\n
Power supply input voltage<\/td>\n100 \u2013 300 VAC<\/td>\n<\/tr>\n
Power consumption<\/td>\n0.5 kW<\/td>\n<\/tr>\n
Machine operating voltage<\/td>\nmax. 58 VDC<\/td>\n<\/tr>\n
Dimensions and Weight:<\/b><\/td>\n<\/td>\n<\/tr>\n
Drive unit \u2013 Length\/Width\/Height<\/td>\napprox. 485 \/ 175 \/ 450 mm<\/td>\n<\/tr>\n
Power supply unit \u2013 Length\/Width\/Height<\/td>\napprox. 380 \/ 180 \/ 210 mm<\/td>\n<\/tr>\n
Base machine \u2013 Net weight<\/td>\napprox. 18 kg<\/td>\n<\/tr>\n
Drive unit \u2013 Net weight<\/td>\napprox. 8 kg<\/td>\n<\/tr>\n
Technical changes reserved<\/sub><\/td>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t
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OPERATION<\/h3>

Place the reference setting gauge onto the tool setting fixture and set the micrometer screw to the reference diameter.Then place the machine onto the tool setting fixture and preset the boring diameter. Insert the pilot with support spider into the valve guide and lock it securely in place.Mount the machine onto the pilot and position the tool tip just above the upper edge of the seat ring pocket.<\/p>

BORING<\/b>Start and execute the boring process by pressing the power button. Repeat the boring process once or twice until the oversize diameter is achieved.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\n<\/div>\n

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Download VD4HD-ADM Brochure\n<\/h3>\t\t\t\t<\/div>\n\t\t\t\t
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Related Content<\/h2>\t\t\t\t<\/div>\n\t\t
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Retro-Fit action<\/h3>\t\t\t\t<\/div>\n\t\t\t\t
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\"\"With the Retrofit Promotion from Hunger, you can get your “old” machine ready for daily repair work again: (Applies to VDS2.3E, VDS2.5E, and VD4E) Your Advantages: Flexible supply voltage from 100-300VAC Price savings of up to 46% compared to a new unit More powerful motors and more efficient control result in 50% higher power transmission during turning Ecologically sensible, as only the necessary parts are replaced.View details<\/a><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Clamping Cylinder Heads\n<\/h3>\t\t\t\t<\/div>\n\t\t\t\t
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\"\"Application: Heavy cylinder heads from large diesel engines can be clamped securely and easily on the extremely robust WV assembly stand for maintenance and repair work.View details<\/a><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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VD4HD<\/h3>\t\t\t\t<\/div>\n\t\t\t\t
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VD4HD-RC<\/h3>\t\t\t\t<\/div>\n\t\t\t\t
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\"\"Facing lathe for diameters up to 650 mm.View details<\/a><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Boring Seat Ring Holes<\/h3>\t\t\t\t<\/div>\n\t\t\t\t
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\"\"Application: With the VD4HD-ADM boring machine, valve seat ring holes in the cylinder head can be bored out for the installation of oversized seat rings.View details<\/a><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Repairing Conical Surfaces<\/h3>\t\t\t\t<\/div>\n\t\t\t\t
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\"\"Application: With the VD4HD\/-30\u00b0 cone lathe, the conical surface on the valve cage can be repaired.View details<\/a><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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VDS2E\/2.5HD<\/h3>\t\t\t\t<\/div>\n\t\t\t\t
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\"\"Valve seat lathe for seat diameters 35 – 120\/140 mmView details<\/a><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\n<\/div>\n\n<\/div>\n\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

Boring Seat Ring Holes Home \/ Seite \/ Boring Seat Ring Holes VD4HD-ADM Boring Machine Application: The VD4HD-ADM boring machine is designed to bore out valve seat ring bores in cylinder heads for the installation of oversize seat rings. Operating Principle: The standard bore is progressively bored out from top to bottom with a fine […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":2672,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_eb_attr":"","_templately_pack_id":"","_templately_imported_at":"","_templately_source":"","_templately_import_session_id":"","site-sidebar-layout":"no-sidebar","site-content-layout":"","ast-site-content-layout":"full-width-container","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"disabled","ast-breadcrumbs-content":"","ast-featured-img":"disabled","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"class_list":["post-2720","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.ludwig-hunger.de\/en\/wp-json\/wp\/v2\/pages\/2720","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ludwig-hunger.de\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.ludwig-hunger.de\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.ludwig-hunger.de\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ludwig-hunger.de\/en\/wp-json\/wp\/v2\/comments?post=2720"}],"version-history":[{"count":5,"href":"https:\/\/www.ludwig-hunger.de\/en\/wp-json\/wp\/v2\/pages\/2720\/revisions"}],"predecessor-version":[{"id":3134,"href":"https:\/\/www.ludwig-hunger.de\/en\/wp-json\/wp\/v2\/pages\/2720\/revisions\/3134"}],"up":[{"embeddable":true,"href":"https:\/\/www.ludwig-hunger.de\/en\/wp-json\/wp\/v2\/pages\/2672"}],"wp:attachment":[{"href":"https:\/\/www.ludwig-hunger.de\/en\/wp-json\/wp\/v2\/media?parent=2720"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}