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Rough idle due to odd firing engine, made worse by the Posted by SWEDECAR [Email]  (#112)  [Profile/Gallery]
(more from SWEDECAR) on Sun, 16 Nov 2003 13:49:07
In Reply to: Volvo PRV V6...what exactly was so bad? Ours was fine.., Alex Athanasiou, Sun, 16 Nov 2003 09:52:09 Members do not see ads below this line. - Help Keep This Site Online - Signup |
CIS fuel injection system and the addition of O2 sensor. Engine actually runs better at idle when O2 sensor is unplugged.
I think your 76 was before the addition of O2 sensor.
Bad casting of aluminum block creating pin hole here and there where coolant leaked out.
One of the worst ones was when the hole happened to be behind the oil filter.
God!! did it take time to find the reason why coolant got into the oil. Not until the oil filter was removed and coolant system put under pressure did the leak became visible.
Too narrow oil canals/holes for camshaft lubrication. Rumor is that the Volvos rolled of the ship from Sweden with worn out cam lobes.
This was made worse by that the camshafts are inserted from rear to front of engine (three different sized bearings/journals).
Seasoned Volvo techs came up with the solution to drill 2 holes through the fire wall to pull the cam shafts through.
If the cam journals would have been turned the other way, it would have been dirt simple to pull the shafts out forward and the biggest journal would have been where the most load is (sprocket/timing chain side).
Strict oil changes saved some of them. Just like what's needed on todays Saabs.
Valve cover gaskets that started to leak way to early and front engine cover gasket that failed.
Volvo came out with a sturdier sheet metal reinforced valve cover gasket many years later and the front engine cover gasket is usually replaced with anerobic sealant nowadays.
Very difficult to get to any coolant pipes, hoses or sensors running through the valley between cylinder.
The easiest (but more expensive) way was to remove the whole intake manifold and redo everything is one sweep.
Anders
posted by 63.196.59...
, Sun, 16 Nov 2003 13:49:07 <-- Viewing This Message
, Sun, 16 Nov 2003 15:53:06, Sun, 16 Nov 2003 10:53:57
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