Lack of compresion on Cyl 4 - Ferrari Life
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post #1 of 21 Old 04-24-2012, 01:38 PM Thread Starter
 
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Lack of compresion on Cyl 4

Hi all,

I carried out a compression test as I always though the car lacked some power and had some thought that there may be a problem. Anyway very low compression on 4th Cylinder. Not over sure what this means and if there is a way to trey and avoid pulling engine out to repair valves or piston. Is there another way to check more exactly the problem? I have heard of a leak down test? Any hint on how to do this? If it is a valve problem can I get away without removing engine and repairing it in place?

Many thanks
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post #2 of 21 Old 04-24-2012, 01:41 PM
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rjk- Welcome to Ferrari Life. What model Ferrari is it?

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post #3 of 21 Old 04-25-2012, 10:36 PM
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A few thoughts:
- Did you ensure the carburettor throttle body butterflys were fully open?
- Have you thought about proceeding with a leak down test?

Hope it helps.
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post #4 of 21 Old 04-26-2012, 05:02 PM Thread Starter
 
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Hi Taz and scm246

I have owned the car since 89. Cam from a collection of classics sat in a barn! Complete rebuild and bare metal fare and paint. New interior and wheels. took over my life!! Had it in the south of France for ages where she is at the moment again! One of the very rare rare original factory whites!!?? Remember a very sure and slighty cocky report about a one and only white Bianco dino around. Well not quite as I have found three white Bianco original spec dino's. Yes still rare in there own right at this count. Well back to the issue of number 4. Will do a leak down this week end see what comes of it. I think regardless we are looking at engine out and rebuild.//// Valve most proberbly the cause?

Last edited by rkjcooper; 04-26-2012 at 05:03 PM. Reason: Dino 246GT
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post #5 of 21 Old 04-26-2012, 09:41 PM
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rkj- Sorry, just noticed your post was in the Dino section.

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post #6 of 21 Old 04-27-2012, 01:23 AM
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The excellent Dino compendium shows there were 247 Dinos produced in Bianco Polo Park white. One of my cars (03342) was originally supplied new in this colour but repainted to red in 1981. The "rare" white is called Bianco Luna Metallizzato and only one car was supplied in this colour.

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post #7 of 21 Old 04-29-2012, 06:29 PM
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Quote:
Originally Posted by iainuk View Post
The excellent Dino compendium shows there were 247 Dinos produced in Bianco Polo Park white. One of my cars (03342) was originally supplied new in this colour but repainted to red in 1981. The "rare" white is called Bianco Luna Metallizzato and only one car was supplied in this colour.
I saw that "Bianco Luna Metallizzato" in the Compendium color spectrum as was draw to it - yet stock white doesn't illicit the same reaction to me. I think it is a metallic with a broad luster and bet it really flatters the lines of the Dino.
Have you ever seen it in person?
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post #8 of 21 Old 04-29-2012, 11:40 PM
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Quote:
Originally Posted by SCM246 View Post
I saw that "Bianco Luna Metallizzato" in the Compendium color spectrum as was draw to it - yet stock white doesn't illicit the same reaction to me. I think it is a metallic with a broad luster and bet it really flatters the lines of the Dino.
Have you ever seen it in person?
No I'm afraid I haven't. I'd be intrigued to see what it looked like though.

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post #9 of 21 Old 04-30-2012, 12:07 AM
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Quote:
Originally Posted by rkjcooper View Post
Hi all,

I carried out a compression test as I always though the car lacked some power and had some thought that there may be a problem. Anyway very low compression on 4th Cylinder. Not over sure what this means and if there is a way to trey and avoid pulling engine out to repair valves or piston. Is there another way to check more exactly the problem? I have heard of a leak down test? Any hint on how to do this? If it is a valve problem can I get away without removing engine and repairing it in place?

Many thanks
If it is valve related or piston related issue you will have to remove the engine.
I know of situations where the engine is fed air via the spark plug and valve stem seals are changed but the layout of your car will not allow for this type of work I do not think.
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post #10 of 21 Old 04-30-2012, 06:20 PM
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Not if it is in Cylinders 4-6, those readily accessible.

Glass half full, the owner is listening...

Last edited by USADino; 04-30-2012 at 06:35 PM.
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post #11 of 21 Old 05-06-2012, 02:37 PM Thread Starter
 
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Hi Again,
Not been able to get stuck into the car for a while but back to the leak down test. Any easy ways to do this? SCM246, are you saying I do not need to remove engine if its No4,5or6? This is the row along the bulkhead though.
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post #12 of 21 Old 05-09-2012, 10:27 AM
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Originally Posted by rkjcooper View Post
Hi Again,
Not been able to get stuck into the car for a while but back to the leak down test.
Any easy ways to do this?
SCM246, are you saying I do not need to remove engine if its No4,5or6? This is the row along the bulkhead though.
An easy way to do a leak down test is buy the kit yourself, depends on how much of a DIY guy you are. Kits can be had at $50 on the low end (New Cylinder Leak-Down Tester Test Pistons Rings Valves | eBay).
You can also hire a shop to do it, it is a fairly common task in a standard PPI

Peter is right, the leakdown test may reveal you have to pull the engine, I just didn't want to say die.
Then again, if you have some friends that don't mind helping you can pull the engine, pic att. It is a slippery slope but you'll be able to do things easier with the better access of a removed engine.
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post #13 of 21 Old 05-30-2012, 07:51 PM
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You do not need to remove the engine, both left and right head can be removed with the engine in place, takes no more than 3 hours from start until the heads are on the bench
when the heads are gone inspect each cylinder so no scratches or cracks
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post #14 of 21 Old 06-17-2012, 05:28 PM
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Behind the engine (i.e. Forward as we view it) I see the cross braces exposed, don't you have a sheet metal cover or did that need to be removed as part of the prep?
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post #15 of 21 Old 06-18-2012, 03:39 AM
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Quote:
Originally Posted by dino246gts View Post
You do not need to remove the engine, both left and right head can be removed with the engine in place, takes no more than 3 hours from start until the heads are on the bench
when the heads are gone inspect each cylinder so no scratches or cracks
WOWwwwww !!!

w/ smiles
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post #16 of 21 Old 06-18-2012, 09:26 AM
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Just wondering

Quote:
Originally Posted by dino246gts View Post
You do not need to remove the engine, both left and right head can be removed with the engine in place, takes no more than 3 hours from start until the heads are on the bench
when the heads are gone inspect each cylinder so no scratches or cracks

Those pistons look quite blackened: Did you wind up pulling that engine anyway. This is regardless of the compression/leakdown reads.

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post #17 of 21 Old 06-25-2012, 01:16 AM
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Originally Posted by Jimmy Chen Shiba DDS View Post
WOWwwwww !!!

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i have 28 years experience from working with Dinos, thats why only need 3 hour
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post #18 of 21 Old 06-25-2012, 01:17 AM
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Quote:
Originally Posted by Granucci View Post
Those pistons look quite blackened: Did you wind up pulling that engine anyway. This is regardless of the compression/leakdown reads.
if you remove your heads you also have this black shit on the pistons
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post #19 of 21 Old 06-25-2012, 01:22 AM
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Quote:
Originally Posted by SCM246 View Post
Behind the engine (i.e. Forward as we view it) I see the cross braces exposed, don't you have a sheet metal cover or did that need to be removed as part of the prep?
heat shield is behind what you see
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post #20 of 21 Old 06-25-2012, 09:44 AM
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Just a thought on the reason for a single low compression number. Run the compression test multiple times as sometimes a speck of carbon can get between a seat and valve. We found this on John Corbani's car when we went to Santa Barbara to view it for a PPI. It stumped us. Then we performed the compression test several times and it cleared with the cylinder number returning to be in line.
Just a thought
.


Quote:
Originally Posted by dino246gts View Post
if you remove your heads you also have this black shit on the pistons
05702 had this too
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Last edited by USADino; 06-25-2012 at 10:19 AM.
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