Now...I'm totally confused
#41
10-17-2015, 05:45 PM
I find this post as pretty much over kill of a non issue. Out of the 3 Volvo's we've had (164 , 240 and 740) the engine noise had been similar. On the 240 and 740 the valves were checked and adjusted at 50K miles and have never needed another adjustment. Sold the 240 at 150K miles and presently have the 740 with 356K miles. This engine is pretty much bullet proof as I have had the typical piston slap starting back at 175K. It sounds like a diesel at startup but somewhat quiets down when warm. Does it have blow by , yes , does it leak some oil , yes (rear seal) and does it burn oil , no. The mfg. at the time we bought the 89 recommended 10W-40 which I use and change now at 5K miles (done at 3K for 1st 15 years). Oil pressure is normal as checked by installing a mechanical gauge in the low oil pressure port next to the filter. If the OP opens the oil fill cap and has the car started cold he will see oil moving is my bet. If he thinks that a port is plugged (highly unlikely ) then just do an engine flush but assuming regular oil changes with high detergent oil there should be no issues. So check the oil pressure cold and hot and if it is not normal then tear it down otherwise live with the noise.
Here's an interesting observation: I took the filler cap off when cold and started the engine and placed a white napkin over the filler hole. Result - dry, no oil. Revved it slightly and again dry, no oil. When it warmed I got some oil splash on the napkin at idle and a lot more as I revved it. So it's got oil to the valves but I guess not enough after it drains.
#43
10-17-2015, 09:59 PM
#44
10-20-2015, 11:16 AM
One other question, if I may, I've heard a lot of references to oil coolers on the 740 and 940 Turbos. And I've seen the coolers on the 740's, it stands vertically nest to the radiator. But there is no similar cooler on a 940. Are they referring to the oil filter adapter when they say "oil cooler"? If so does it have an internal thermostat?
#45
10-20-2015, 01:12 PM
Starting in 1992, or '93, the 940 no longer have the external coolers as the filter housing is water cooled--no thermostat. I changed over a '91 940 to a system from a '94 940 and did some inquiries as to which system is better but got no definitive answers--I guess they both do fine... Better than that oil cooler leaking and making a mess...
#47
10-20-2015, 02:35 PM
Starting in 1992, or '93, the 940 no longer have the external coolers as the filter housing is water cooled--no thermostat. I changed over a '91 940 to a system from a '94 940 and did some inquiries as to which system is better but got no definitive answers--I guess they both do fine... Better than that oil cooler leaking and making a mess...
Interesting. Thanks
#48
10-20-2015, 09:29 PM
Starting in 1992, or '93, the 940 no longer have the external coolers as the filter housing is water cooled--no thermostat. I changed over a '91 940 to a system from a '94 940 and did some inquiries as to which system is better but got no definitive answers--I guess they both do fine... Better than that oil cooler leaking and making a mess...
Are you sure? Because I see the 2 turbo oil lines coming out of the filter mount(cooler). The only water lines go directly to the turbo.
#49
10-21-2015, 10:51 PM
https://volvoforums.com/forum/volvo-...0-turbo-29028/
I guess it's purpose is similar to a water thermostat in letting the engine warm up quicker. That's why I was wondering if the 940's have one.
#50
10-22-2015, 03:05 PM
Starting in 1992, or '93, the 940 no longer have the external coolers as the filter housing is water cooled--no thermostat. I changed over a '91 940 to a system from a '94 940 and did some inquiries as to which system is better but got no definitive answers--I guess they both do fine... Better than that oil cooler leaking and making a mess...
#51
10-22-2015, 09:07 PM
I stand corrected. Now that I know those are water lines going through the filter mount then it doesn't make sense to have a thermostat in the oil cooler/mount/adapter. The water circuit thermostat will control the cooling and heating of the oil cooler. Clever Swedes.
#52
10-27-2015, 10:23 PM
Starting in 1992, or '93, the 940 no longer have the external coolers as the filter housing is water cooled--no thermostat. I changed over a '91 940 to a system from a '94 940 and did some inquiries as to which system is better but got no definitive answers--I guess they both do fine... Better than that oil cooler leaking and making a mess...
#54
10-28-2015, 09:36 AM
#55
11-02-2015, 09:32 PM
Final Update: I pulled the pan and one of the pickup tube seals looked pinched(and hardened). I put in new seals and put it backed together. I fired it up, let it warm up and my hot idle went from 12 lbs to 36 lbs and hot at 2000 rpm went from 36 lbs to 46 lbs. I went back to synthetic 10w30 and the valve chatter is pretty much gone. It was a lot of work but I'm sure glad it wasn't the bearings. I did follow a lot of the guidelines on Brickboard but improvised and came up with a few tricks of my own. I'll post those on another thread in case someone else is facing this problem.
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