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only 2 litres of oil in V7 sport 1972

J

janbey

Just got it firing!
Joined
Nov 28, 2022
Messages
5
Location
Belgium
Hello,

I'm new here and already looking for an answer. I can only refill my engine with 2 litres of oil. All resources say 3.5 L of oil. The dipstick is working fine, and with 2 Litres of oil, it is reaching the maximum on the Stick. My Guzzi is an USA version, maybe this explains the difference ? Anyone already had the same issue ?
Thanks in advnce,
jan
 
What makes you think your dipstick is accurately marked?

I know of no engine Moto Guzzi manufactured that uses only 2L of motor oil.

Given the value of an original V7, I would not run the engine with so little oil.
 
Hello, thanks for your answer.

The dipstick is the original one.
When I put in more oil, it comes out of the carter ventilation tubes.
It's a strange situation, i know, but it is what it is. Maybe the carter pan is not original ?

thanks,
jan
 
You are welcome.

However…Something is not correct.

The engine uses 3.5 L of oil. Period.

I suggest you post some pictures of your engine, the dipstick, the vent tubes.

Without visuals, what you are asking is impossible.

Also it would be helpful to get some background and history of this motorcycle to give it some context.

You cannot seriously think that anybody can give you usable information from a 2 sentence post.

Also, I have no idea what you mean by carter pan and carter ventilation tube. Please explain.
 
Ok, will do. This evening. Thanks. Will add more pictures later.
 

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Not surprised you are getting blow by with 3.5 liters. The engine is similar to the T and T3. When I had them any more than 2.5 US quarts would cause oil to blow out the vent box. Do make sure the vent box is finctioning properly. Also if you haven't performed a leak down test please do as at its age, the rings may be worn causing excessive crankcase pressure wich will cause what you are experiencing. Also the V7 Sport has the shallow oil pan which can't hold that much. Guzzi is well known to over specify engine oil capacity. Even when Guzzi added a sump spacer with the CA II, 3 US quarts was about all that would work without issue.
 
Johns spot on here. As the Texas turnip used to say for his 1050 big block engines, "three quarts out, three quarts in". If the sport has a shallower pan it's going to be less.
I did have a 1972 850 Eldorado that had something stick once and spit all three quarts out in 100 miles. That or it didn't like that brand of oil as I had to change in BFE on a trip.

"I know of no engine Moto Guzzi manufactured that uses only 2L of motor oil."

Scott be careful how you answer as currently all small blocks will be spitting oil all over if you stick in the two liters Guzzzi calls for.
I find 1.6 US quarts to be plenty on the 2017 and up and 1.5 on the 2016 and down.
 
As you wish…

My point was on the bikes made from that time period. The V7 Sport is 1971-1974.

Just because I say I don’t know, doesn’t imply gospel. Only that I don’t know.

You are all convinced that the factory is run by a collection of a moronic idiots.

I do not hold this view.

Every case of overfilling I have ever seen, involved not draining properly or failing to remove and scrape the sump on early Eldorados, Sports, Ambassadors, T5’s, etc. Nothing more.

Full quantities usually assume a virgin block with no oil. Good technique involves shorting this amount and measuring as you go. Running, then rechecking.

I’ll leave you to your own devices.
 
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Hi, thanks for the replies. I already checked vent box and pipes, everything is ok.
Almso tested the compression on both cilinders, both the same.
No oil consuming.
Will send more pictures of the engine.tomorrow
thanks for your help.
 

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janbey said:
Hi, thanks for the replies. I already checked vent box and pipes, everything is ok.
Almso tested the compression on both cilinders, both the same.
No oil consuming.
Will send more pictures of the engine.tomorrow
thanks for your help.
Click to expand...
Compression isn't the same as a leak down test. What were your compression readings?
 
I know, but high compression means piston rings are ok. If I remeber well +13.5 kg, same on both sides.
Engine is running well, on very low idle speed and is fast. Everything is working fine, the only problem is that only 2 litres of oil can be refilled. Will post more photos later.

thanks for your help.
 
janbey said:
I know, but high compression means piston rings are ok. If I remeber well +13.5 kg, same on both sides.
Engine is running well, on very low idle speed and is fast. Everything is working fine, the only problem is that only 2 litres of oil can be refilled. Will post more photos later.

thanks for your help.
Click to expand...
Yes that is high. I have never seen an engine with 192 PSI compression.
 
John, on some of my race engine builds, with tight tolerance (45-thou) head squish on flow-optimized high-comp pistons, I’d see as high as ~205 psi, but again, race motors.
People who think they know how to assemble an engine have likely wreaked havoc since the inception of internal combustion. ;)
 
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