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Post by Mypleasure on Jun 2, 2020 11:42:40 GMT -5
Looking for some help from engine mechanically minded members I just ordered and received new serpentine belts for my 2007 Volvo Penta 8.1 GI-H engines. The part number I removed was #3889126. Volvo says the part was replaced by #21132390   As you can see the belt was installed but with great difficulty. The belt tensioner was compressed to the max just to get it on over the pulleys. The tensioner is not relaxed at all and the belt is very tight. This is the same situation on my starboard engine. The old belts came off no problem. This just doesn't seem correct. Help Rick |
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Post by tc33obx on Jun 2, 2020 14:35:21 GMT -5
my pleasure. It's been a while since I worked on Volvo Gas I/O engines. I had them I'm my 322 Monterey, but to me the pattern on the belt bottom doesn't look correct for the pulleys and spline tracks. I'm thinking that is why it is overly tight. There should be tracks in the underside of the belt that matches the spline on the pulley and flywheel
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Post by lg260ss on Jun 2, 2020 17:57:55 GMT -5
The routing appears to be correct, so does the part number. Is there any play in the belt tensioner once the belt is on?
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Post by Av8ator1 on Jun 2, 2020 21:40:37 GMT -5
Does the alternator have an adjustment?
Two boats ago, I got pretty good at changing these belts due to a separate issue, your belt position looks good.
Can you compare the belt dimension to your old belt?
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Post by tc33obx on Jun 3, 2020 10:02:02 GMT -5
I really think the issue is the track on the backside of the belt. In the pick of the belt installed that mypleasure posted. The pattern doesn’t match the splines on the pulleys. In the link that lg260ss posted, you can see exactly what I mean by looking at the backside of the belt and compare it to mypleasure’s picture. I dont think the right part was sent,.
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Post by Mypleasure on Jun 3, 2020 13:31:41 GMT -5
Thank You All,
After reading questions posed back to me and looking at my own pictures I decided to purchase two new belt tensioners and two new idler pulleys because they have corrosion and potentially rough bearings . Also I will check the the power steering pulley for the correct track and will pull it off for cleanup and paint. I will also check for an alternator adjustment, that seam very reasonable. The numbers all match for the part listings. I will spend a little more tine on cleaning up.....Rick
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Post by gofast24 on Jun 4, 2020 9:21:25 GMT -5
The routing appears to be correct, so does the part number. Is there any play in the belt tensioner once the belt is on?
The picture (parts exploded view) in your post shows a crankshaft mounted sea water pump, the other picture (OP's?) shows a separately driven micro v (serpentine) belt driven pump? If the old belt was not shredded or broken I would have just brought it to NAPA or other part house and have them measure it or look up the VP p/n for a replacement. |
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Post by gofast24 on Jun 4, 2020 9:26:44 GMT -5
Typically, in my experience, if a spring loaded belt tensioner is installed the alternator doesn't have a adjustment (not needed?). Did OP use a 1/2" breaker bar to relieve tension on belt to get old belt off and new one one? If not, OP, how did you loosen belt tensioner? Also, how many hours on engines since last belt replacement?
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Post by gofast24 on Jun 4, 2020 9:39:24 GMT -5
Typically, in my experience, if a spring loaded belt tensioner is installed the alternator doesn't have a adjustment (not needed?). Did OP use a 1/2" breaker bar to relieve tension on belt to get old belt off and new one one? If not, OP, how did you loosen belt tensioner? Also, how many hours on engines since last belt replacement? Also highly recommend inputting actual engines serial number into the VP OEM parts store site to obtain as built part identifications vs. just indicating engine model number . There are so many parts breakouts variations of one specific engine model number vs. what was the actual build specification you cant be sure of what you actually need! Experienced this many times until figuring out use engine s/n and not model. |
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Post by lg260ss on Jun 4, 2020 18:12:45 GMT -5
The routing appears to be correct, so does the part number. Is there any play in the belt tensioner once the belt is on?
The picture (parts exploded view) in your post shows a crankshaft mounted sea water pump, the other picture (OP's?) shows a separately driven micro v (serpentine) belt driven pump? If the old belt was not shredded or broken I would have just brought it to NAPA or other part house and have them measure it or look up the VP p/n for a replacement. I don’t think so, looks the same to me. |
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wjh
Full Member
Posts: 51
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Post by wjh on Jun 5, 2020 8:26:10 GMT -5
I really think the issue is the track on the backside of the belt. In the pick of the belt installed that mypleasure posted. The pattern doesn’t match the splines on the pulleys. In the link that lg260ss posted, you can see exactly what I mean by looking at the backside of the belt and compare it to mypleasure’s picture. I dont think the right part was sent,. TC33obx - I believe that you are pointing out that the pulleys on the engine are ribbed and the new belt appears to be a cog-type belt that will not fit in the grooves on the pulleys. If the belt will not seat in the ribs on the pulley system it will cause the belt to be too tight. From the picture, it is hard to tell if this is the case, but it is definitely something to look at. |
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Post by gofast24 on Jun 5, 2020 9:45:51 GMT -5
The picture (parts exploded view) in your post shows a crankshaft mounted sea water pump, the other picture (OP's?) shows a separately driven micro v (serpentine) belt driven pump? If the old belt was not shredded or broken I would have just brought it to NAPA or other part house and have them measure it or look up the VP p/n for a replacement. I don’t think so, looks the same to me. Interesting, the thumb nail picture shows a crank mounted sea water pump but when you open it it shows a separate belt sea water pump? Am I loosing it? |
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Post by Mypleasure on Jun 5, 2020 10:50:02 GMT -5
Good Morning All I was able to get out to the boat yesterday to do some clean-up on the serpentine belt pulleys and paint. I also removed the old tensioners because they didnt operate smoothly and research on Youtube suggested replacement. On a couple of videos the mechanics showed operation limits for the tensioners and mine with the new part number belt moves the tensioners marks past those limit marks. The belts are too short!! See my attached pictures.   Note the two marks on the spring housing of the tensioner and the single mark on the operable portion. The tensioner is relaxed and the the limit marks align. When the belt was installed it pushed the marks past the limit and was at dead stop.. I checked the alternator for adjustment and it appears to be a fixed mount. I did measure and compare the two belts slipping them both over my breaker bar and puled them tight to take the picture. The belts cant grow this much can they? to answer the question about the seawater pump....its is crank mounted on the same belt as the circulation pump above. |
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Post by gofast24 on Jun 6, 2020 11:51:33 GMT -5
Yes, you have a crankshaft mounted sea water pump and yes, you have belts that are too short. There should be markings on the spring loaded idler pulley indicating both max and min belt wear limits, new correct belt, marks on one side , worn belt, mark on other side of scale. From the picture of your fresh water pump (?) the pulley is for a micro groove (also called serpentine) belt. Some brands of belts have cross hatches on the contact side of the belt (the side that engages with the pulley) and some dont, doesn't really matter.
Again, recommend you use engine serial number to find correct parts on the VP OEM parts web site or call VP dealer, give them your engine s/n, and go from there.Or, take old belt to Auto parts store and have them match it, if they can probably 1/2 the price of VP OEM belt?
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Post by Mypleasure on Jun 17, 2020 16:07:45 GMT -5
If anyone is interested I did go to NAPA parts store and bought belts 1 1/2" longer and they work with the new tensioners perfectly in the operation limits. I have a phone call into the Volvo customer service department to suggest they rethink their replacement part number.
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