Aq131A Video Please Help

[Robj]

Re: Aq131A Video Please Help

I have that same engine. These are basically marinized car engines so the local machine shop with some Volvo expertise can help you with your marine motor. I would use an automotive top end gasket set, which is much cheaper than the marine version and it is basically the same.

Before yanking off the head I would check the timing belt to make sure it is on, and I am pretty sure that you can even check the valve springs without removing the head. But I would think that if you have a bad/leaking valve it would show up on the compression test. Mine did.

Good luck

Rob.

 

[Brucetafer]

Re: Aq131A Video Please Help

so after looking at the whole situation, i pulled the valve cover and everything looks perfect, all the valves are within spec, no broken springs, springs are all in spec, so im almost positive that the cam off a tooth... i called a buddy who is a certified technician and he said most likely the cams off, hes seen cars run perfect with a tooth off, and then cars with a tooth off that wont run... how much do you think it will cost labor wise to do that job?? so i dont get ripped off anymore than i have...

also was thinking of doing this work myself, is there timing marks like on the car ones?? if i cant see the marks is there any other way to check it?

 

[proshadetree]

Re: Aq131A Video Please Help

Did you change your plugs and wires? I know they might only be a few years old. I have had several engines kick my butt over ignition troubles. My rv has a 440 fresh tune up 1 year ago. Ran perfect all year. Next year ran like crap off idle. Changed plugs and wires smooth as silk. Rebuild a 350 chevy years ago. man drove it for about 5000 miles. bought a different truck and let her sit for 8 months. called me and said valves were stuck, nope plugs were bad. At work a industrial sweeper would pop out of the carb every time you started to accelerate. Located cylinder by pulling one wire at a time. swapped wire to check problem pop went away. Changed them back pop was back. Tune up cured this one too. Ignition can drive you nuts but in the long run is cheaper than major repairs.

 

[wallerus]

Re: Aq131A Video Please Help

Silly question, have you put it in the water and run it under load?

 

[Don S]

Re: Aq131A Video Please Help

Silly question, have you put it in the water and run it under load?

I don't think it would be a good idea to put a boat in the water with an engine that is blowing fuel out of the carb. For one thing, it won't magically heal, second, it would be a serious fire hazard.

 

[GLENN M]

Re: Aq131A Video Please Help

like everything else electricity will take the path of least resistance,carbon tracks inside cap or bad wires can cause crossfire.advancing or retarding cam enough to backfire would make every cyl backfire.with a belt i no its happened,but in 25yrs ive seen lots of broken and stripped belts but never one thats jumped a tooth.check your cap wires and plugs better change them.

 

[Brucetafer]

Re: Aq131A Video Please Help

thats the one thing that has not been changed by me, the original owner said he changed them and yet they look 10 years old, and just found a small hairline crack on the cap, plug wires look crappy... can i use regular ignition wires?? the dealer said mine are 177.49 and they will take 2 weeks to get.. and the cap and rotor are 100 bucks!!!! jesus.. bust out another thousand!!!

thanks for the help guys, im going to just keep replacing parts until this thing runs like a champ!!!


also, i did run it under load thats how i knew she was really in bad shape... the video is post doing all that work, the previous was horrible, wouldnt even go up to 8 mph, and i messed with the dist cap and got it running to 22 mph but then it would drop a cylinder and bog down after a couple minutes of running, id let the throttle back and it was fine.. so thats with a bad carb, and a non advancing dist and no pertronix...

 

[Don S]

Re: Aq131A Video Please Help

thats the one thing that has not been changed by me, the original owner said he changed them and yet they look 10 years old, and just found a small hairline crack on the cap, plug wires look crappy

Sounds to me like your engine is in need of some good ole TLC and a full tuneup. Cap, rotor, points, condenser, rotor, and plug wires.
Those wires are solid core wires with resistors on the spark plug end. You can get aftermarket tunup parts that are just as good as OEM.

 

[Brucetafer]

Re: Aq131A Video Please Help

thanks guys, don, i already changed the innerds of the dist, the cap has a crack in it, and my volvo guy says that that could be the whole problem...

also i have a set of MSD 8.8MM racing wires brand new cut to length, will those work? the stock wires are just rediculous... and the cap and rotor is rediculous too!

 

[Brucetafer]

Re: Aq131A Video Please Help

ok just ordered all the cap rotor and wires, but the spark plugs were a nightmare to find, the only shop that had anything around here was ngk 4055 iridium plugs and they are the right plugs for my application says ngks website... any body say differently?? also, the volvo guy down the street said its almost positive bad wires cap rotor due to sometimes it revs fine and sometimes it bogs... he watched the movie also...

 

[Brucetafer]

Re: Aq131A Video Please Help

Ok!!!! well, took it out in monterey bay, caught some crab, and trolled for halibut, but top speed, 12 mph...........

3200 rpm no problem, going any faster than that nope,... motor still bogs down at 4500-5000 rpm... and wouldnt even pretend to go past 3200..... new cap, new rotor, new plugs, rebuilt distributor, cleaned out carb, pertronix ignition, new coil, the only thing i can think of is timing off, im pretty sure the motor is on with the timing... is there any way to check cam timing with the valve cover off??? my belt is perfect, and its a nightmare to take that heat exchanger off...

 

[Brucetafer]

Re: Aq131A Video Please Help

oh yeah, when i ran it out of the water, the water from the muffs looked like a pretty rainbow, and it was just really really full of either oil or fuel.... but oil is at the same level on the dipstick...

 

[sqbtr]

Re: Aq131A Video Please Help

Sounds like you have done MOST of the basic maintenance stuff.

I hate to admit it, but, I was around when volvo cars made the transitition from side drafts to fuel inj.

Checking basic cam timing is part of the maintenance program. I have seen balancer bolts left loose that caused keyway wear. 2* at crank means 4* at cam. The tensioner is set at instalation, belt stretch itself can cause a couple of degrees of cam lag. not to mention wander. There is no choke on this engine, worn belt & cold backfire = belt skip. Its JMHO but bite the bullet pull the exchanger and get it done, per the service manual

 

[krisnowicki]

Re: Aq131A Video Please Help

I bet the cam and engine timing are off. I bet the blet has slipped because the tensioner is bad. I had am aq131 do this. Timing belt kept moving because the tensioner was bad. Napa had akit with both the tensioner and belt for under 30 bucks.

 

[picklenjim]

Re: Aq131A Video Please Help

I used to have a 86 Dodge Aries "K" car.They had a overhead cam with the cog belt system. About every 35,000 miles the belt would become loose enough to jump a tooth. It sounded and ran exactly like yours. Powerless, but not missing. Just looking at the belt all seemed fine. You wouldn't have even thought it was that loose. But once you check the marks you would see it was off. You need to find out where the timing marks are which the crank pulley and cam pulley must be aligned with when you install the belt. You will probably have to gain acess to the belt to see the marks. Seeing your video and my past experience my money would be on the belt jumping a tooth.

 

[Brucetafer]

Re: Aq131A Video Please Help

you guys made my heartburn go away, i already have an appointment set up for that, he said around 3 hours for the install since i already have the parts, but still at 125 bucks an hour, its an expensive "guess" anybody have a good write up for how to do that procedure??? i have the volvo manual (thanks don) should that be good enough?? also, the boat ran great all day, never didnt start, never died nothin... so im stoked there... the only big problem is the outdrive is leaking at the cover where the volvo penta 275 sticker is, is that repairable cheaply? or is it bad news bears...

 

[GLENN M]

Re: Aq131A Video Please Help

forget belt if it was it would run like crap all the time period.is it still back firing is it still missing,you just need to finish tune up.you had more than one problem common when maintanence is neglected,sounds like you also have carb issue.if it wont possibly make it past 3200 hows does it bog at 45to5000 rpm. those are not belt symptoms.

 

[Brucetafer]

Re: Aq131A Video Please Help

it wont go past 3200 in the water, 10 mph.... revs in neutral all day long and sometimes bogs down at high rpm and spits up fuel, ive done all the maintenance on it that is required, all new electrical, all new fluids, rebuilt carb...

 

[picklenjim]

Re: Aq131A Video Please Help

forget belt if it was it would run like crap all the time period.is it still back firing is it still missing,you just need to finish tune up.you had more than one problem common when maintanence is neglected,sounds like you also have carb issue.if it wont possibly make it past 3200 hows does it bog at 45to5000 rpm. those are not belt symptoms.

I didn't see anywhere in this thread where he said it was backfiring or missing. I didn't notice any backfiring or missing in the video either. If it had a bad cap it would be backfiring from cross firing or with a bad wire or plug a cylinder would be missing. Now he has a new cap, new rotor, new plugs, rebuilt distributor, cleaned out carb, pertronix ignition, new coil, what else does he need to "finish the tune up" except maybe rebuild the carb. In my opinion it's not a carb problem at all. When the belt jumped a tooth on my car it would start fine and idle fine. Never back fired or missed or died. However the fastest you could get it up to was only 45-50mph. Also with the aircleaner off you could rev the engine and it sounded just like the video. When the fuel sprays up out of the carb it is probably from air/fuel reversion in the intake from the valves being inproperly in time with the pistons. If you have the manual that should be all you need. It should show you everything you need to know. The ones I have done were really not that big of a job.

 

[picklenjim]

Re: Aq131A Video Please Help

I looked at the manual and it looks like a pretty straight forward job. Getting everything out of the way will be all the work. It's all shown on pages 71 and 72. There is 3 places the timing marks will need to be set to install the belt. Crankshaft,intermediate shaft and cam. Photos 183,184 and 185.One question would be if your engine has the cam timing mark plate on front of the valve cover. It's shown in picture 185 and says not all engines have it. May not be needed anyway as the belt has timing marks on it. Also it states at the bottom of page 72 that the belt tensioner should be set at least once per season and belt replaced every 500 hours. This is the kind of maintence people don't normally follow up on. It's possible it hasn't been adjusted for years, if ever.