<div dir="ltr">Dowel Bolts for my BN1...<div><br></div><div><img src="cid:ii_kmee7tau0" alt="image.png" width="472" height="354"><br></div><div><img src="cid:ii_kmee891k1" alt="image.png" width="472" height="354"><br></div><div>From my post on the AH Experience...</div><div><br></div><div><div class="gmail-text" style="line-height:1.3;color:rgb(0,0,0);font-size:14px">The engine to transmission bolts and nuts were originally Whitworth, British Standard Fine to be specific. 5/16" W or 3/8"BSF (same size, different measurement) X 1-1/4" to 1-5/16" shouldered bolts. There are Five (5) of these bolts.<br style="clear:both"><br style="clear:both">There are two bolts that hold the starter in place, but they are 1-5/8" in length.<br style="clear:both"><br style="clear:both">Two special "Dowel" Bolts as pictured used to help center the transmission to the engine, and six (6) bolts, spring washers and nuts. From the Concours Guidelines...<br style="clear:both"><br style="clear:both"><span style="font-weight:700">Dowel Bolts</span><br style="clear:both">The factory used two dowel bolts to align the engine and transmission components.<br style="clear:both"><br style="clear:both">• A dowel bolt has a more accurate diameter on its unthreaded portion, resulting in a<br style="clear:both">more precise fit.<br style="clear:both">• Unlike a regular bolt, which is a little loose in the hole, a dowel bolt fits with very<br style="clear:both">little side play.<br style="clear:both">Without the dowel bolts, the engine and transmission could be slightly misaligned,<br style="clear:both">which can cause premature wear of gearbox bearings and pilot bushes, and cause the<br style="clear:both">clutch to "hang up".<br style="clear:both"><br style="clear:both"><span style="font-weight:700">100</span><br style="clear:both"><br style="clear:both">• The dowel bolts have two flats on an otherwise round head.<br style="clear:both">• The dowel bolts go into the "1:00" and "7:00" (positions top right and bottom left).<br style="clear:both">There are two circular countersink/recess in the bell housing flange at these two<br style="clear:both">positions which help the shorter bolt go in farther so that enough treads are<br style="clear:both">exposed on the other side.<br style="clear:both">• The standard 100 bell housing bolts are 1 1/4" long and BSF threaded.<br style="clear:both">The dowel bolts are 1/8-inch shorter and its bolt head is round with two flats<br style="clear:both"><br style="clear:both">To be absolutely factory original, all Whitworth fasteners should have a black phosphate, and not a zinc finish as pictured.<br style="clear:both"><br style="clear:both">Cheers,<br style="clear:both"><br style="clear:both">Curt</div><br class="gmail-Apple-interchange-newline"></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Mar 17, 2021 at 9:00 PM Alan Seigrist via Healeys <<a href="mailto:healeys@autox.team.net">healeys@autox.team.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">dennis welch has them. they do alot of gearbox upgrades, etc., so that's why they have them.<br><br><a href="https://www.bighealey.co.uk/index.php?route=product/product&product_id=33802&search=dowel%20bolt" target="_blank">https://www.bighealey.co.uk/index.php?route=product/product&product_id=33802&search=dowel%20bolt</a><br><br><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Mar 18, 2021 at 7:26 AM Michael MacLean via Healeys <<a href="mailto:healeys@autox.team.net" target="_blank">healeys@autox.team.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div style="font-family:"times new roman","new york",times,serif;font-size:16px"><div dir="ltr">Anyone know where I can get the dowel bolts required to mount the transmission to the block of my BN2?</div><div dir="ltr">Mike MacLean<br></div></div></div>_______________________________________________<br>
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