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guide for timing belts[ALL/1988] posted by Vic on
Sunday, 8 February 1998, at 5:08 p.m.
Ran out of power with my 1990 740 gl wagon. Overhead cam. Mechanics said it it jumped timing when a plastic "guide" sheard for the timing belts. They replaced it with a new metal one. Started the car: still no power in #1 cylinder
Apparently the valves bent. Anyone ever heard of this?
Thanks.
Vic P.
Re: guide for timing belts[ALL/1988] posted by Randy Starkie on
Sunday, 8 February 1998, at 7:58 p.m.
>Ran out of power with my 1990 740 gl wagon. Overhead cam. Mechanics said >it it jumped timing when a plastic "guide" sheard for the timing belts. They >replaced it with a new metal one. Started the car: still no power in #1 cylinder
>Apparently the valves bent. Anyone ever heard of this?
The b230f is a non-interference type engine i.e. the valves will not come in contact with the pistons if the belt jumps time or breaks. You say you have no power in #1 cyclinder- do you have any compression is that cylinder?
Re: guide for timing belts[ALL/1988] posted by Vic on
Tuesday, 10 February 1998, at 12:50 p.m.
Thanks for your replies. I do not have a non-interference engine, it turns out.
I did not have pressure in the #1 cylinder. New valves and a new metal timing gear "guide" and I'm back on the road. "Ouch" is right.
Re: guide for timing belts[ALL/1988] posted by Joe Capra on
Saturday, 14 February 1998, at 10:16 p.m.
I just had that happen... here's an important tip to ALL 16v owners out there..
(possible recall?) THERE IS A PLASTIC TOOTHED TENSIONER PULLEY FOR THE BALACE SHAFT BELT THAT BLOWS UP AND SENDS TEETH FLYING INTO THE CAMSHAFT BELT/PULLEY INTERFACE AREA, CAUSING SKIPS AND POSSIBLE SEVERE HEAD/VALVE DAMAGE (I got lucky) GET THAT TIME BOMB OUT OF YOUR ENGINE A.S.A.P.! Volvo should recall that pulley before it ruins more B230f's.
Re: Balance shafts -Comments from our mechanics?[ALL/1988] posted by Dave Stevens on
Sunday, 15 February 1998, at 3:51 p.m.
From above post:
>>I just had that happen... here's an important tip to ALL 16v owners out there.. (possible recall?) THERE IS A PLASTIC TOOTHED TENSIONER PULLEY FOR THE BALACE SHAFT BELT THAT BLOWS UP AND SENDS TEETH FLYING INTO THE CAMSHAFT BELT/PULLEY INTERFACE AREA, CAUSING SKIPS AND POSSIBLE SEVERE HEAD/VALVE DAMAGE (I got lucky) GET THAT TIME BOMB OUT OF YOUR ENGINE A.S.A.P.! Volvo should recall that pulley before it ruins more B230f's. <<
Is this problem really that common? Any comments from our mechanics?
Also, somebody, somewhere (alt.autos.volvo I think) recently posted that they'd disconnected the balance shafts altogether on their B234F. Improved low end power dramatically (makes some sense). Claimed it didn't increase engine vibration all that much (I'm surprised). Apart from shortening the life of the engine mounts, any comments?
Re: Balance shafts -Comments from our mechanics?[ALL/1988] posted by Joe Capra on
Sunday, 15 February 1998, at 9:07 p.m.
A machinist friend of mine tells me that this imbalance can actually split an engine block under the right conditions. The belt's about 30.00 from Gates ant any NAPA, and it's a 45 min install, required every 50K. Not worth the risk , to be sure! You need to do the cam belt anyway, so why not run this thing right . At 156 BHP, it's fine for normal driving anyway, stock. I think.
Re: guide for timing belts[ALL/1988] posted by Terry Bowerman on
Monday, 16 February 1998, at 6:14 p.m.
Is this a problem for 16v engines only. What about the 8 valve B230f's?
Re: guide for timing belts[ALL/1988] posted by Dave Stevens on
Monday, 9 February 1998, at 3:07 a.m.
For the 740/760 series, if you had a multi-valve B234F or B280F V-6 you would have an intereference engine where a broken/slipped timing belt could result in damaged valves (at a minimum). The B230F and B230FT are non-interference. A blown head gasket could give a low compression reading just like a damaged valve. If you notice excessive steam coming out the tailpipe, white scum in the oil filler area, oil in the coolant reservoir, water or oil on a spark plug then that would also indicate a blown gasket. As Randy noted, do a proper compression check (with all plugs out). That will tell you if the head should come off to assess the damage. Ouch!