Is possible that in all four tubes been identical cracks??? Is strange
Oz1200Guzzi Don Abbondio
Posts : 6084 Join date : 2014-03-13 Age : 69
Subject: Re: The definitive guide to Rollerisation Sun May 22, 2022 2:41 pm
Looks like casting marks to me, but WTF would I know?
Pete Roper GRiSO Capo
Posts : 10667 Join date : 2013-05-29 Age : 67
Subject: Re: The definitive guide to Rollerisation Sun May 22, 2022 6:06 pm
I've seen it several times. On the ones I've seen they are cracks. The good news is that they don't seem to cause any further issues. The main one I would of been concerned about would be the exhaust valve seats dropping out but I haven't heard of that ever happening.
In my experience such cracks have occurred principally on engines still running a closed loop map. Is that a relevant factor? I dunno, but if the engine is ridden a lot in closed loop where the AFR is kept deliberately lean the exhaust gasses are going to be hotter and the chance of an expansion related failure is going to be more likely.
Does that theory have legs or am I just talking out of my arse? I've no idea. I'm not a metallurgist.
kiwi dave GRiSO Capo
Posts : 735 Join date : 2014-04-23 Age : 76
Subject: Re: The definitive guide to Rollerisation Sun May 22, 2022 8:29 pm
Pete Roper wrote:
Does that theory have legs or am I just talking out of my arse? I've no idea. I'm not a metallurgist.
Metallurgist? Â It sounds to me you're a ventriloquist! Â
lcjohnny GRiSO Capo
Posts : 1470 Join date : 2016-01-25 Age : 69
Subject: Re: The definitive guide to Rollerisation Sun May 22, 2022 10:38 pm
I suggest using a 90⁰ engineers probe to see if they are cracks or raised casting marks.
From your photogrsphs they don't look dark enough or sharp edged enough to be cracks. So as they seem identical i would assume casting marks. But if s probe or feeler gauge goes into them that proves your point.
lizardking Carlotto
Posts : 27 Join date : 2022-04-13
Subject: Re: The definitive guide to Rollerisation Mon May 23, 2022 6:04 am
lcjohnny wrote:
I suggest using a 90⁰ engineers probe to see if they are cracks or raised casting marks.
From your photogrsphs they don't look dark enough or  sharp edged enough to be cracks. So as they seem identical i would assume casting marks. But if s probe or feeler gauge goes into them that proves your point.
What is 90⁰ engineers probe?
lcjohnny GRiSO Capo
Posts : 1470 Join date : 2016-01-25 Age : 69
Subject: Re: The definitive guide to Rollerisation Mon May 23, 2022 6:14 am
Steel rod with sharp end at 90⁰ May be called a scriber or dental pick
lizardking Carlotto
Posts : 27 Join date : 2022-04-13
Subject: Re: The definitive guide to Rollerisation Sun Jul 03, 2022 12:36 pm
The heads were x-rayed and it turned out that they were not cracked. These are foundry marks.
I have another question: should the right timing chain tensioner insert be mounted with a small hole in the smaller part in some specific way, does it not matter?
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Pete Roper GRiSO Capo
Posts : 10667 Join date : 2013-05-29 Age : 67
Subject: Re: The definitive guide to Rollerisation Sun Jul 03, 2022 1:26 pm
Right and left tensioner plungers are different. The valve hole goes towards the reservoir on both.
lizardking Carlotto
Posts : 27 Join date : 2022-04-13
Subject: Re: The definitive guide to Rollerisation Sun Jul 03, 2022 2:26 pm
Pete Roper wrote:
Right and left tensioner plungers are different. The valve hole goes towards the reservoir on both.
Subject: Re: The definitive guide to Rollerisation Sun Jul 03, 2022 3:46 pm
Yup. It's there to allow oil from the reservoir into the chamber above the valve. If you mean does it have to be aligned in any way other than in the reservoir? No. It'll spin around in service anyway.
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lizardking Carlotto
Posts : 27 Join date : 2022-04-13
Subject: Re: The definitive guide to Rollerisation Wed Jul 13, 2022 3:20 pm
With the help of Pete Roper's instructions, I was able to replace the timing tappets on my GRiSO. However, I have another question. The bike is running perfectly just as it was before the repair. It is impossible to discern any difference in any respect. Therefore, is it necessary to change the ECU software, or can I run on the current software? Does it pose a risk of malfunctions?
beetle GRiSO Capo
Posts : 10180 Join date : 2013-09-30
Subject: Re: The definitive guide to Rollerisation Wed Jul 13, 2022 5:01 pm
There’s no need to update the software. There’s been no change to the GRiSO map or software since 2010.
. [You must be registered and logged in to see this image.] . In GRiSO we trust! .
Pete Roper GRiSO Capo
Posts : 10667 Join date : 2013-05-29 Age : 67
Subject: Re: The definitive guide to Rollerisation Wed Jul 13, 2022 5:03 pm
If your bike is currently running the final iteration of the factory maps then you simply need to clear the trims which can be done by pulling the main 30A fuse or disconnecting the battery briefly. If you were running a non factory map or one of the earlier versions from the factory then it should be remapped.
If you want it to run better than it ever has just buy one of Mark's maps and stick it in.
lizardking Carlotto
Posts : 27 Join date : 2022-04-13
Subject: Re: The definitive guide to Rollerisation Sun Jul 17, 2022 12:48 pm
I'm sorry for the naive question, but with what software can you do it in Moto Guzzi? Could I also ask for a user Mark?
beetle GRiSO Capo
Posts : 10180 Join date : 2013-09-30
Subject: Re: The definitive guide to Rollerisation Sun Jul 17, 2022 1:26 pm