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#151 |
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Re: My 1968 C-20 Golden Anniversary Project
Disassembled.
Found some small metall particle below the camshaft. All others without issues.
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#152 |
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Re: My 1968 C-20 Golden Anniversary Project
Block cleaned with air gun and petroleum, this works realy good.
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#153 |
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Re: My 1968 C-20 Golden Anniversary Project
Found out that the cam is grind (casting number) 930. The GM # is 3896929.
Overlap 90° Rocker ratio 1.5 Intake timing Opens BTC: 38° (BTC= Before top dead center) Intake timing Closes ABC: 92° (ABC= After bottom dead center) Lift .3900" (with 1.5 rockerarm, means lift on the cam is less) Exhaust timing opens BBC 88° Exhaust timing closes ATC 52° Lift .4100" (with 1.5 rockerarm, means lift on the cam is less) Duration 320° In my service and overhaul books 1968 327 the lift for inlet and outlet are the same, strange. camshaft journal ok (1.8682-18692"), surface ok
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#154 |
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Re: My 1968 C-20 Golden Anniversary Project
Cam bearings cleaned and checked, ok
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#155 |
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Re: My 1968 C-20 Golden Anniversary Project
Cam assembled, crankshaft bearings cleaned and inspected.
Marking on bearing:GMM420 57653 244J3 Marking on thrust bearing: 001 170d7 B GMMA 57871
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#156 |
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Re: My 1968 C-20 Golden Anniversary Project
More pictures
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#157 |
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Re: My 1968 C-20 Golden Anniversary Project
New rear main seals (FEL-PRO P2900) prepared and oil filter adapter installed.
Marking on old rear main seals: BRUMMER 474
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#158 |
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Re: My 1968 C-20 Golden Anniversary Project
Cover for the timing gear cleaned and prepared.
Marking on the old seal: 3980267 SDI
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#159 |
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Re: My 1968 C-20 Golden Anniversary Project
Some measures with the crank shaft:
4577 327 62-67 Truck small Journal 2.30“ main Journal x 2.00“ Rod Journal x 3.25“ stroke. Assuming the GM part number is # 3889304. The 4577 crankshafts were in my opinion over the counter production (my engine is a guarantee short block "CE".
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#160 |
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Re: My 1968 C-20 Golden Anniversary Project
Some piston measurements.
Piston 3796494 (GM 3816974) They are 62-8 Chev. H.D. Truck, low compression, recessed head .085 x 3.125, 8.0:1 compression. They have a steel insert cast into the top ring groove (armored groove) These pistons are a cast piston. Piston Rings changed against Sealed Power Performance Ring Set E-251K: 5/64 x 5/64 x 3/16 (in.) groove widths. Steel top ring. Grey iron with phosphate coating 2nd ring. The top ring is a plain ring. Unlike Hastings and others. No markings. Installs either side up. Second ring has a dot on top side.
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#161 |
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Re: My 1968 C-20 Golden Anniversary Project
Oil pump pressure set to "stock"
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#162 |
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Re: My 1968 C-20 Golden Anniversary Project
Today tried to assemble. Got a reverse. In the overhaul book is written:
327 11/32-24 connecting rod cap 35 ft lbs 327 7/16-14 main bearing cap 80 ft lbs Tried the main caps, after 70 ft lbs I got a bad feeling, stopped. tried 35 ft lbs on the rod bolt , 30 ft lbs ok than the bolt would be longer and longer and longer ![]() ![]() ![]() Now ordering new ARP bolts and try again
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#163 |
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Re: My 1968 C-20 Golden Anniversary Project
Finished timing gear cover,
chain play new timing gear from 1968: in: 3.868"; out: 3.541" Lesson learned: It is not necessary to remove the "half moon" key in the crankshaft but was a good training. ![]()
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#164 |
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Re: My 1968 C-20 Golden Anniversary Project
some more:
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#165 |
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Re: My 1968 C-20 Golden Anniversary Project
After I got the right washers, finished the valve and spring assembly heads.
Installed height between 1.725" and 1.730" (origin is 1.750"). Valve pressure measured by 1.750" = 132 ft lbs. , second measurement after movement of the spring: 126 ft lbs. and third measurement after further movement of the spring 121 ft lbs. Valve pressure measured by 1.730" = 130 ft. lbs. seat pressure Valve pressure measured by 1.725" = 132 ft. lbs seat pressure (The Summit 174000 valve spring kit has the following pressures.Seat Pressure at Installed Height 1.750" (lbs):125 lbs. Open Pressure (lbs):325 lbs.)
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#166 |
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Re: My 1968 C-20 Golden Anniversary Project
Some more:
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#167 |
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Re: My 1968 C-20 Golden Anniversary Project
I ordered the wrong set kit SUM-174001 get seals for 0.307 in. Valve Guide Diameter (in): 0.485 in.
Than I ordered the set for the right valve diameter SUM-174000 0.344 in. (11/32), but the Valve Guide Diameter (in): 0.530 in. instead of my 0.560" Than I ordered additional seals by Alex parts: .520"- .565". In my opinion all three different seals are the same. Lesson learned, read exactly "before one click buy".
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Best regards GerhardH! Members met: 68 short step, 68bowtie, 72c20customcamper, botmfedr1, C/10 King, Chevyland, cornerstore, dmjlambert, fun in dirt, GMan69, Ol Blue K20 1968 CHEVROLET C20 Custom Camper 50th Anniversary, Long bed (LB) 8', 327 V8, Air Condition (AC), Power Steering (PS), Power Brake (PB), Z62 Custom & Comfort Appearance, Turbo Hydramatic TH 400 http://67-72chevytrucks.com/vboard/s...d.php?t=760400 Last edited by GerhardH; 10-08-2020 at 01:51 PM. |
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#168 |
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Re: My 1968 C-20 Golden Anniversary Project
Suffered the next defeat. My block is Chevrolet small block 2-Bolt Main, small journal, therefore I ordered the ARP-134-5002 Kit.
To short- assuming that the CE (service replacement/warranty engine, casting # 3959512) was prepared as small and big journal to provide solutions for all guarantee cases?
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Best regards GerhardH! Members met: 68 short step, 68bowtie, 72c20customcamper, botmfedr1, C/10 King, Chevyland, cornerstore, dmjlambert, fun in dirt, GMan69, Ol Blue K20 1968 CHEVROLET C20 Custom Camper 50th Anniversary, Long bed (LB) 8', 327 V8, Air Condition (AC), Power Steering (PS), Power Brake (PB), Z62 Custom & Comfort Appearance, Turbo Hydramatic TH 400 http://67-72chevytrucks.com/vboard/s...d.php?t=760400 Last edited by GerhardH; 10-15-2020 at 04:37 AM. |
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#169 |
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Re: My 1968 C-20 Golden Anniversary Project
Continue!
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#170 |
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Re: My 1968 C-20 Golden Anniversary Project
Some more
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#171 |
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Re: My 1968 C-20 Golden Anniversary Project
Fuel-,oil pump and cylinder heads
The small plastic bushing in my opinion don't needed if you have an oil pump shaft with a guide (both in picture 1). Copper oil pump gasket SUM-111480, in my opinion normally not needed, but can't hurt.
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Best regards GerhardH! Members met: 68 short step, 68bowtie, 72c20customcamper, botmfedr1, C/10 King, Chevyland, cornerstore, dmjlambert, fun in dirt, GMan69, Ol Blue K20 1968 CHEVROLET C20 Custom Camper 50th Anniversary, Long bed (LB) 8', 327 V8, Air Condition (AC), Power Steering (PS), Power Brake (PB), Z62 Custom & Comfort Appearance, Turbo Hydramatic TH 400 http://67-72chevytrucks.com/vboard/s...d.php?t=760400 Last edited by GerhardH; 10-18-2020 at 08:36 AM. |
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#172 |
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Re: My 1968 C-20 Golden Anniversary Project
Head bolts ARP #134-3701 (12-point)
16 pcs 1.750" UHL 04 pcs 3.060" UHL 14 pcs 4.180" UHL Working perfect. Torque: 70 ft lbs
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#173 |
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Re: My 1968 C-20 Golden Anniversary Project
Preparing rockers, pushrods etc.
Despite I ordered the same part number EPR 34B (8 pcs. each) twice I received two different lengths pushrods=== TIME DELAY!!! Lesson learned: Always order one complete set. Right length 7.794“ Wrong lenght: 8.544“ Time for preparing accessoiries.
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#174 |
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Re: My 1968 C-20 Golden Anniversary Project
Preparing valve covers.
Grommets are perfect: PCV Valve grommet 42052 Dorman and/or WVE 2P1006
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Best regards GerhardH! Members met: 68 short step, 68bowtie, 72c20customcamper, botmfedr1, C/10 King, Chevyland, cornerstore, dmjlambert, fun in dirt, GMan69, Ol Blue K20 1968 CHEVROLET C20 Custom Camper 50th Anniversary, Long bed (LB) 8', 327 V8, Air Condition (AC), Power Steering (PS), Power Brake (PB), Z62 Custom & Comfort Appearance, Turbo Hydramatic TH 400 http://67-72chevytrucks.com/vboard/s...d.php?t=760400 |
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#175 |
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Re: My 1968 C-20 Golden Anniversary Project
That's gonna be a nice engine!
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"Some Days Chickens And Some Days Feathers" Dale XNGH ECV Sam Brannan 1004 R.I.P. 67ChevyRedneck R.I.P. Grumpy Old Man |
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