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Old 02-13-2019, 07:50 PM   #151
Dewey72
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Join Date: Jun 2013
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Re: K30 Downgrade to Cummins Project

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Originally Posted by Vintage Windmills View Post
Seems like there's no traffic in this area of the forum anymore.... no posts in any threads in the diesel conversions section today. Overall traffic on the entire website seems to be a fraction of what it was a few years ago. Where did everyone go? Are people reading this thread besides those that post? Is there a better area for these projects?
Ya I follow along and check in at least once a day but just realized I haven't posted on my thread in almost a year!! My bad. I'll try to get a update this weekend.
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Old 02-13-2019, 09:21 PM   #152
Vintage Windmills
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Location: Prior Lake, MN
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Re: K30 Downgrade to Cummins Project

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Originally Posted by Dieselwrencher View Post
Have you looked at the industrial 5,9 tensioners to see if they'll work for you? I've had very little luck with the 3rd gen after market ones living short lives. Would an intercooled 1st gen fan hub suite your needs better? They are raised up a little more than the 2nd gen ones. You could make your own mount with DOM, flat plate and gussets. Tony made one for his suburban but I'm not sure he posts on here much anymore. I'll message him and have him put his pics here. I sent you an email with a pic of some hooks too.
I found a new 3rd gen Cummins genuine tensioner for $75 so went with that.

An IC 1st gen hub would probably work better but they are hard to find. Do you have one? I wish I had one to at least borrow to look at/measure. Unfortunately I sold both 92 dodge w250's i had awhile back. I may just fab one up like you say.

Got your email. now I see you emailed me back late Jan, not sure why i didn't get it or see it before!

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Originally Posted by Dewey72 View Post
Ya I follow along and check in at least once a day but just realized I haven't posted on my thread in almost a year!! My bad. I'll try to get a update this weekend.
Sounds good! You have a great project there and we'd like to see more of it.


I took the running boards off awhile back but forgot to post a pic. I think it looks better
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67 GMC K1500 Custom- 305V6 SM420, PTO, Ram Assist, yellow (the outcast) (project period correct upgrades)
67 GMC C2500 351V6 TH400, AC, PS, PB (can't decide what to do with. Update, decided to keep and will restore )
86 CHV K30 502 th400, apple red NEW
71 CHV K20 350 SM465, ochre (saved work truck)
71 CHV K20 292 SM465, white, tach, PTO, (future project)
72 CHV K20 350 350th, medium blue (project stocker)
01 CHV K2500hd crew, indigo blue

^3 dont run and the others don't see winter either
'86 K30 Cummins "Fireside" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=649649
'71 K20 "get driveable" thread: http://67-72chevytrucks.com/vboard/s...d.php?t=590642
'72 K20 Build Thread: http://67-72chevytrucks.com/vboard/s...=493477&page=6
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Old 02-14-2019, 11:51 AM   #153
randy500
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Location: Tacoma, WA
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Re: K30 Downgrade to Cummins Project

I started reading your build a couple weeks ago, I like it.

Looks like your working out the ac compressor mount. I bought the Cummins high mount freighliner parts and modified the alternator bracket so I could use the dodge denso unit. When I was doing the changeover I felt like I could have modified the low mount ac bracket like you are working on.
Looks like you will have to change water necks for belt clearance.
When I put the ac on mine I tried the tensioner up high like you have yours sitting (4bt style) I hade very little belt clearance and the belt length had to be spot on, took a bunch of fitting and belt searches and in the end the tensioner did not tension the ac compressor enough which caused it to chip from belt skipping and when that happens The tensioner has wild adjustment fluctuations. It was jumping crazy back and forth trying to keep tension.

I read it’s best to have the tensioner last in-line and that’s what I did, I put it down by the frame rail, fixed the problem.

For belt length I cut my old dodge belt then used it to wrap and mark needed belt length, laid it out flat and measured the length then found that length online in the gates or dayco online catalog. Belts are $50 or so local but I found the ones I needed on rockauto, amazon and eBay for about $20 or less.
There are plenty of 8rib belts in the length you need...that had me worried too.

For your tach, you can get a tach signal from the 2nd gen crank sensor, I wrote up how to do it, just set your aftermarket gas tach to 4 cyl mode and it will read correctly (2 pulse per revolution) which you get from the 2nd gen sensor.

You have probably already looked it up but a 1st gen fan hub will move the fan up and center I believe, it also gives you .75” or so of more fan to radiator clearance, the pulley is different from 2ng gen so you need it with the fan hub.
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Old 02-14-2019, 12:44 PM   #154
randy500
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Re: K30 Downgrade to Cummins Project

I will share some A/C things I learned too...
The sanden sd715 compressors, I think all have the same bolt pattern and the variances are compressor clutch style and clutch groove centerline and back head style.
The wires vary and have or do not have diodes, change out as needed.

I bought a new compressor from acparts.com for about $130, it was a random compressor that had the proper 8rib centerline and a head configuration I thought would work and it did. I searched by price then researched attributes of compressor number on the sanden website.

As far as your home made bracket...if you can somehow duplicate the lower compressor bolt centerline to above the waterneck it will all line up when installed. I think you could fasten the existing bracket to a bench, find or attach a measuring point and modify away.
Maybe you Could make a flat plate for the ac compressor that mounts to the lower bolt holes with spacers and hole that clears the waterneck? If so you could lay out the pattern on flat plate then bolt it to the dodge cast iron bracket.
You can ballpark the lower alternator mount and adjust with shims or spacers to get the centerline right.

I made my own lines using aeroquip ez-clip fittings and line, these lines and fittings are expensive in kit form or new but can be found on ebay super cheap. They “crimp” using cv joint clamp type pliers, aeroquip sells the crimpers for $120 or so.
I used Oetiker side jaw pincer pliers for single ear clamps. I used the single ear clamps on my fuel, vacuum and pressure lines too, eliminating gear driven hose clamps which I hate.
Compatable fittings to aeroquip are available under weatherhead and red dot brand names too (eBay and other sites), they are all identical.
There are a limited number of ac line sizes and fitting types, fitting charts are online, just match up to the parts you have like condenser, evaporator and compressor head or manifold,
Nice looking lines, very heavy duty and easy to assemble and crimp at home.

I have some pictures of the ac stuff in my crew cab preview thread.
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Old 02-14-2019, 04:02 PM   #155
Dieselwrencher
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Re: K30 Downgrade to Cummins Project

Quote:
Originally Posted by Vintage Windmills View Post
I found a new 3rd gen Cummins genuine tensioner for $75 so went with that.

An IC 1st gen hub would probably work better but they are hard to find. Do you have one? I wish I had one to at least borrow to look at/measure. Unfortunately I sold both 92 dodge w250's i had awhile back. I may just fab one up like you say.
Jud, the only one I have is on my Longhorn. I'll dig through my stash and see what else I have. I used to have a couple weird ones off of 4BT's.
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