So my streetfighter was habing blowby, and after doing a compression test, they decided to rebuild the engine under warranty. Now I am not sure how good rhe dealership knows to rebuild the engine, but either way, I need to make sure they are doing everything right. So since they are opening the engine, apart from piston rings change, is there anything else I should ask them to do? So that I dont have to open the engine anytime soon again? Engine has done 6800km on odo.
2022 Streetfighter v4 engine rebuild
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At a minimum, replace all the bearings and install a new water pump. All new gaskets. Check the valves and provide you with a list of the valve clearances.
I'd ask for an itemized list of the parts which were replaced which would include the part numbers.
Maybe pistons?
I'd ask for an itemized list of the parts which were replaced which would include the part numbers.
Maybe pistons?
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I would think it's hard to give what I think is an accurate compression measurement even if altitude is known as I wouldn't know what the air pressure would be on the particular day it's tested. There's calculators online that can get you to an expected value for altitude and compression ratio. I would ask them for the measurement though.
By reset, do you mean replace? Probably more important to replace the plastic guides, the chain doesn't have all that many miles and I haven't read of any timing chain failure related issues on the V4 bikes. Even with the guides, it's dependent on what they look like.
Have you considered shipping the bike to another dealer to do the rebuild? Maybe one who works with race teams or has more experience with track bikes?
By reset, do you mean replace? Probably more important to replace the plastic guides, the chain doesn't have all that many miles and I haven't read of any timing chain failure related issues on the V4 bikes. Even with the guides, it's dependent on what they look like.
Have you considered shipping the bike to another dealer to do the rebuild? Maybe one who works with race teams or has more experience with track bikes?
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What dealer is going to do the work? Has the technician ever disassembled and put back together a V4 motor? You’re going to be at the mercy of the dealer on what they’ll change if this is done under warranty. I’d assume they’re going to replace the cylinder half case. Ok to reuse pistons if they’re ok and not damaged. I’d ask for all measurements and photo documentation of all old parts that are reused. The cams will be retimed no matter since the head has to come off. If there’s no crank damage they’ll most likely reuse the main and conrod bearings. Would ask for photos of the bearings
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Bearings and water pumps are two part that should never be reinstalled used.
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Nothing wrong with reusing main and conrod bearings as long as they’re in spec, don’t have wear, and give proper clearance. Also I can’t see them replacing a good water pump. In an ideal world, sure but this is Ducati and I’d bet they’re trying to do this as cheap as possible. The dealer will most likely also be looking to do as little work and reuse as many parts as possible to maximize their return. Definitely make sure all seals are replaced and not reused.
Any chance you can be present during the rebuild to document things?
Any chance you can be present during the rebuild to document things?
Unfortunately there is only one dealer in my state. And this dealer has branches all over my country. Kinda like a monopoly. I know another race shop which does this, but then I would have to pay them for everything. With the dealer, everything is being covered under warranty.
The dealer said they have worked on two panigale v4 and 3 multistrada rebuilds. But the problem is there are very few people here who actually use the bike to its potential. So with rebuild even if these guys have low compression on their rebuilds, they only drive in cities and they dont push the bike, so they are not bothered with bad rebuilds. I use it mainly on track, so kinda problematic for me.
So if I make a list of things,
1. Change all seals and gaskets
2. Change bearings and water pump
3. I was informed by my race workshop that if I plan to change piston rings, I should ask to change them cylinder block as well as pistons else the dealer can mess up if they dont calculate the ring size properly. So this is another thing I guess
4. Chain guides and list of valve clearances
5. Measurements and photo docs for all replaced parts
I do plan to go there during the rebuild. They are kinda very slow in their work, so have to see how much time I can spend there. My main concern is that official ducati clearance for all parts are way too low and I think what they say is normal as per their schedule, is bad for me on track. So just concerned that they might not want to replace a few parts thinking its normal for road use, but it wont.
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Dont official dealers have trainings and access to Ducati Bologna if there are questions/problems ?
They do have access. But some technicians think they know more and end up using their own brain instead of following the manual. Have seen this a lot and thats where .... starts to mess up.
I would request a replacement with a factory assembled longblock. I can't find a part number for one but the dealers should have access. Nickasil bores burnish a little bit during initial break-in so the second ring set will be harder to get seated and unless the mechanic truly understands how to hone nickasil he should just leave it alone. I can't see Ducati replacing the cases (and your workshop guys are right they should). Ducati doesn't supply oversize rings typically because nickasil normally just lasts. At 6800km everything else should still be beautiful. The chain guides and chains will be fine (if they replace them ok but most likely not needed). I would personally inspect the plain bearings to look for anything strange. Due to marginal oiling on these I would absolutely ensure the rod bearings and the mains be replaced. It is really important that the mains are not put in any looser than nominal (I'd set them a bit tighter) and the rods at nominal. New rod bolts always (mechanic should know this). Ducati rod bolts are pretty crappy (read the specs) so a new one is not necessarily all that good. A soggy (low torque to full stretch) one should be just smacked on the threads and tossed away. I won't use Ducati torquing BS and will only install measuring stretch. Unfortunately Ducati only puts a point on the thread end so they need to be chucked up in a lathe and a point added to the head end. A good guy will have checked the head and main studs (they need to pull torque up crisply) as he disassembles. If the heads and cases show brinelling from the head gaskets (typical) the heads and cases should be lapped on a surface plate to remove. The rods are fed thru a drilling down the middle of the crank and the feed is out of the side case and there's a lipped seal that allows this. That seal needs to be replaced everytime the case is removed IMHO. And ask them to replace the oilpump with the latest revision. Valvetrain should be reshimmed to factory assembly specs. Good luck. I hope they know what they're doing.
Gotcha, so new list would be:
So if I make a list of things,
1. Change all seals and gaskets
2. Change bearings and water pump
3. I was informed by my race workshop that if I plan to change piston rings, I should ask to change them cylinder block as well as pistons else the dealer can mess up if they dont calculate the ring size properly. So this is another thing I guess to ask them to replace entire longblock
4. Chain guides and list of valve clearances
5. Measurements and photo docs for all replaced parts
6. Check conrod wear and plain/main bearings and replace them if required
7. Pray for a lot of luck from somewhere :|
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I would submit all these requests in writing and also get responses in writing. Don’t forget to demand a warranty on the repair work (2 years seems fair if they stand by their work). I wouldn’t argue over any reused parts because the ball is in their court and a blown motor will be on them. If they don’t do any of your requests you’ll have that in writing and a solid case for a replacement motor.
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