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06-10-2017, 09:13 PM | #1 |
Senior Member
Join Date: Feb 2009
Location: Northern Nevada
Posts: 7,256
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How to mount an A/C compressor on a 402
I pulled the A/C nearly 30 years ago. That always bothered me. Luck would have it I bought another 402 truck with A/C. Overall I'd say it was mostly stock. Turns out I had all the brackets for the truck I'm working on, and some of the hardware.............Still, somehow this was a real (*^(^ noting how this is slammed together. I referenced the assembly manual quite a bit. This was a "dry run" only on the truck I'm restoring. Next run is easy peasy.
Anyway, here are my notes. Perhaps others may find them useful. Sure helped me, but what a pain in the shorts. Where you see RH (TS), that just means the RH truck side. Also, flathead bolt only means the bolt head isn't recessed/flanged.......Keeps me organized. I welcome any corrections, please. First image IDs the parts. Then notes, then a few pics of the brackets assembled on the truck. Man, this stuff fits nicely. NOTE: Be sure the stud is installed first. Do not tighten the brackets until after the compressor has been installed. Bottom bracket (A portion of the bracket is a triangle. The LH (TS) portion of the triangle mounts onto the face of the head): • The bottom front of the bracket mounts to the lower front corner of the head using a 5/8" flathead bolt and washer. The bolt thread is 7/16-14 x 1. NOTE: This mounts the negative battery cable as well. • The bottom of the bracket mounts to the RH (TS) front post in the engine block using a 9/16" flathead bolt, washer and lock washer. The bolt thread is 3/8-16 x 1. • The bottom rear of the bracket mounts using a stud on the front hole of the exhaust manifold. The stud is 3/8-16 on both ends. The longest end (1.1/4") inserts into the exhaust manifold. The short end (1") mounts the bracket. A washer fits between the exhaust manifold and stud nut. The bracket is secured using a nut and lock washer. Front bracket & hose retainer (A portion of the front bracket has a half moon for the front of the compressor. The hose retainer looks like a cabinet handle): • The top of the hose retainer mounts to the front bracket using a 1/2" flathead bolt. The bolt thread is 5/16-24 x 7/8. The bolt inserts from the front. • The slot portion of the front bracket is placed on front of the bottom bracket. These secure to the top front outside corner of the head using a 5/8" flathead bolt and washer. The bolt thread is 7/16-14 x 1.1/4. The bolt will be positioned near the bottom of the slot in the bracket. Other: The bottom of the hose retainer, and the front and bottom brackets are secured using a 9/16" flathead bolt, lock washer and nut. The bolt thread is 3/8-16 x 1.1/2. The bolt inserts from the front. Front arm bracket (Longest of the two arm brackets. The slot portion is to the compressor. A triangle is engraved onto the front of the bracket): This bracket secures to the top hole on the face of the RH (TS) head using a 5/8" flathead bolt and lock washer. The bolt thread is 7/16-14 x 1. The arm is positioned behind the front bracket for mounting the front of the compressor. NOTE: The front arm bracket extends approx. 9/10" beyond the top edge of the front bracket. Brace support (small three hole bracket, looks like Mickey Mouse): The brace support mounts using the RH (TS) exhaust manifold bolts & lock washers. These are the 2nd & 3rd bolts & washers from the front. Brace (shaped like a snake. The slot end is the top): The brace secures to the front of brace support using a 9/16" flathead bolt and nut. The bolt thread is 3/8-16 x 1. The bolt inserts from the front. Rear arm support (shaped somewhat like a horse shoe, with a ridge on top for mounting the rear arm bracket): The rear arm support mounts using the RH (TS) intake manifold bolts & lock washers. They are the 2nd & 4th bolts & lock washers from the front. NOTE: The standard intake manifold bolts are 3/8-16 x 1.1/4. They're too short for this bracket. If using a lock washers, then the bracket requires 3/8-16 x 1.3/4 bolts. Rear arm bracket (shortest of the two arm brackets. The ridge at the center faces up): The slot end of this bracket is secured on back of the rear arm support using a 9/16" flathead bolt, washer and lock washer. The bolt thread is 3/8-16 x 1. The bolt inserts from the rear. The rear arm bracket is positioned in front of the brace for mounting the rear of the compressor. Compressor plate (looks like a frog): The plate mounts to the back of the compressor using two 9/16" flathead bolts and lock washers. The bolt threads are 3/8-16 x 1.1/8. Three thin shims were used between the compressor and plate. NOTE: The triangle engraved on the plate faces out. Mounting the compressor: • Position the compressor's flange in front of the front bracket. • The compressor plate mounts to the rear bottom bracket using one 9/16" flathead bolt and nut. The bolt thread is 3/8-16 x 1.1/4. The bolt inserts from the front. • The top front engine side of the compressor mounts using one 1/2" flathead bolt, washer and lock washer. The bolt thread is 5/16-18 x 1. The bolt inserts from the rear. Assembly order: Bolt > washers > front arm > front bracket > compressor. NOTE: Some debate whether or not this takes a 5/16-24 bolt instead. I can only speak for two compressors, and an 18 seemed to thread much better. That and the "sample" truck used an 18. • The top rear of the compressor mounts using one 9/16" flathead bolt, washer and locker washer. The bolt thread is 3/8-16 x 1. The bolt inserts from the rear. Assembly order: Bolt > washers > brace > rear arm > compressor. NOTE: The bolt seems a bit short. 1.1/8 would be better. • The bottom front of the compressor mounts using one 1/2" flathead bolt and lock washer. The bolt thread is 5/16-24 x 1. The bolt inserts from the rear. Assembly order: Bolt > lock washer > front bracket > compressor. • A 1/2" flathead bolt and lock washer mounts the compressor to the front bracket. The bolt thread is 5/16-24 x 5/8. The hole is located above the hose retainer. The bolt inserts from the rear. NOTES: This MIGHT be used to mount the compressor ground. I need this bolt. See assembly manual pages 525-527.
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Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly kit for restoring the (a) truck from the ground up. My build thread, and more on the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025 Last edited by 71CHEVYSHORTBED402; 06-10-2017 at 11:42 PM. |
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