2270 Build Thread |
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2270 Build Thread |
McMark |
Feb 4 2014, 12:00 PM
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#21
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
I'm building this 2270 and I thought this would be a good one to document. I'm going to try and cover every little aspect of the build, although I'm not necessarily going to break down every process into a step by step.
I'm starting with a 1.7 'W' case. I did a quick line bore check and it's a nice STD case. But more on that later when I actually measure the line bore accurately. Case Preparation - In this section I'm covering all the modifications and inspections to be done on the bare case. Threaded Gallery Plugs, Resurface Oil Filter Mount I used my slide hammer setup to pull the original gallery plugs. I'm just doing the 'normal five'. In this picture also shows the oil filter mount face - I pull the studs and true the surface up to ensure a good, leak-free seal. HV Oil Pump I have a Schadek oil pump that I've cut in half to mark the case for 'port matching' the oil pump. The ports on the case are smaller than the oil pump, so this simply eases the transition. I use a carbide cutter for aluminum in a pneumatic die grinder to carefully open up the holes. Cleaning Stud Threads I chased all the M8x1.25 studs on the case. This eases installation, but also ensures more accurate torque. Any fastener that has a specific torque value should have clean threads. The rust/dirt/sealant/etc on the surface will make the fastener harder to turn, which means you're getting a slightly false torque reading. You'll see the head studs have all been removed. I don't use a tap or die to clean the head stud or the case threads because I've seen this result in loose head studs. I don't touch this parts of the case, and I use a wire wheel on the bench top grinder to clean the threads without risk of removing material. |
McMark |
Feb 12 2014, 10:26 PM
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#22
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
Got a little more work done.
Checking the line bore I put the case together and tightened the through bolts hand tight. The first picture shows the tiny gap in the center bearing. I tightened the through bolts to 5 ft/lbs and the gap goes away. This is good. (IMG:style_emoticons/default/wink.gif) (IMG:http://www.914world.com/bbs2/uploads/post-419-1392259349.jpg) (IMG:http://www.914world.com/bbs2/uploads/post-419-1392259359.jpg) Then I checked the diameter of the main bores. The bore gauge gets set at the wear limit. If the bores read above this value it needs to be redone. All of these measured between 0.003" and 0.0015" under the limit measured both ways (think X). 0.003" under the wear limit is basically untouched, AKA STD or standard. If the measurements were over the wear limit, the case would need to be bored to the next size. That would make the case 1st oversize, meaning it needs bearings with a larger outside diameter. (IMG:http://www.914world.com/bbs2/uploads/post-419-1392259368.jpg) |
ww914 |
Feb 13 2014, 08:16 AM
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#23
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914 Convert Group: Members Posts: 435 Joined: 29-September 11 From: Central Coast, CA Member No.: 13,621 Region Association: Central California |
(IMG:style_emoticons/default/blink.gif) Dumb question here: I thought checking the line bore was making sure that the holes line up as well as the size of the holes, no? (IMG:style_emoticons/default/confused24.gif)
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