 Stumped, Low Compression |
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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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Replies
| injunmort |
Sep 8 2016, 07:58 AM
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#2
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Senior Member Group: Members Posts: 1,024 Joined: 12-April 10 From: sugarloaf ny Member No.: 11,604 Region Association: North East States |
if it were mine and it is out and apart. i would do a light hone on the cylinders (break the glaze), check my ring gaps again, stagger the gaps at 60 degrees and reassemble the cylinders. on the heads, fill each combustion chamber with lighter fluid with spark plugs in the holes and check for leakage past the seats. the chambers should hold the fluid. if they don't, lap the valves into the seats and try again until it seals. reassemble.
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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 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 Root_Werks Also noting you stated 3-4 "side" doesn... Sep 9 2016, 10:18 AM 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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