 Stumped, Low Compression |
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Tuesday, 15 July 2025 |
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| AKJammer |
 Sep 7 2016, 09:04 PM
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#1
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Newbie  Group: Members Posts: 6 Joined: 19-July 15 From: Alaska Member No.: 18,971 Region Association: Pacific Northwest  |
Engine: 1.8 1974.
I tore down the engine to replace Dead gaskets and seals. Purchased new jugs and pistons reassembled the engine. Fired it up and have 90 lbs of compression on 3-4 125 on 1-2. Completed a leak down test and all is good as it is holding what compression there is... Tore the engine down again and measured the cc of the heads and they are all the same. Part number 021.101.371S on both heads. Measured the deck height of the pistons at TDC and they are all the same.... Head gasket shims are all the same. What am I missing??? Thanks Jammer! |
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| Root_Werks |
Sep 9 2016, 10:18 AM
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#2
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Village Idiot Group: Members Posts: 8,739 Joined: 25-May 04 From: About 5NM from Canada Member No.: 2,105 Region Association: Pacific Northwest 
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Also noting you stated 3-4 "side" doesn't fire until the rpm's are up. Sounds like an idle circuit adjustment/issue/vac leak etc. more than compression.
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Posts in this topic
AKJammer Stumped Sep 7 2016, 09:04 PM
rgalla9146 Fuel injection or carbs ?
If carbs, were the ca... Sep 7 2016, 09:14 PM
AKJammer
Fuel injection or carbs ?
If carbs, were the c... Sep 7 2016, 09:19 PM rgalla9146
Fuel injection or carbs ?
If carbs, were the ... Sep 8 2016, 05:42 AM Root_Werks
[quote name='AKJammer' post='2395384' date='Sep 7... Sep 8 2016, 12:15 PM AKJammer
[quote name='AKJammer' post='2395384' date='Sep ... Sep 8 2016, 01:07 PM injunmort ring gap, ring stagger, valve seats, valve clearan... Sep 7 2016, 10:29 PM AKJammer
ring gap, ring stagger, valve seats, valve cleara... Sep 7 2016, 10:46 PM wndsrfr
ring gap, ring stagger, valve seats, valve clear... Sep 8 2016, 05:27 AM stugray
Rings haven't seated.....drive it like you st... Sep 8 2016, 05:49 AM The Cabinetmaker Sounds like an aka problem Sep 8 2016, 06:00 AM Vacca Rabite Compression on a fresh top end-er builds as the ri... Sep 8 2016, 07:57 AM injunmort if it were mine and it is out and apart. i would d... Sep 8 2016, 07:58 AM AKJammer Thanks All! I have some Ideas of what to do n... Sep 8 2016, 12:10 PM r_towle You may want to check to make sure the case is fla... Sep 8 2016, 07:05 PM old dog Just a thought.... Is the cam timing correct ? Goo... Sep 9 2016, 08:54 PM rgalla9146
Just a thought.... Is the cam timing correct ? Go... Sep 10 2016, 04:03 AM |
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