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351 Cleveland Pinging problem
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sly376 Offline
#1 Posted : Monday, 11 September 2006 7:58:52 AM(UTC)
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Hey I have a XC Falcon 351 cleveland & it just recently started pinging BADLY anything after 2500 with sudden accelaration, I have checked timing, base timing is 12 deg BTDC Total advance is about 36 deg BTDC, it has always ran good with that ignition timing setup. I tried retarding it still pings! I'm running 98 octance fuel, I have also checked for bent push rods & their all fine too. I thought it was a dizzy problem so I got a brand new crane dizzy with a Hi-6 & LX 92 coil & still is doing the same thing. Tried changing carbies as I thought it might be leaning out through out the RPM! Any ideas guys cause I have run out! Any help will be appreciated. Thanks
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#2 Posted : Monday, 11 September 2006 7:26:43 PM(UTC)
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Maybe the harmonic balancer has slipped.
Check that on No 1 TDC that the timing marks on the pulley line up.
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sly376 Offline
#3 Posted : Tuesday, 12 September 2006 7:33:56 AM(UTC)
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Tried that, everything lines up spot on.
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XB351 Offline
#4 Posted : Tuesday, 12 September 2006 7:36:51 AM(UTC)
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You have email.

XB Fairmont sedan : [email protected]
XB Fairmont sedan : [email protected]
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#5 Posted : Tuesday, 12 September 2006 10:21:05 PM(UTC)
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throw some cold plugs in it that will help.
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sly376 Offline
#6 Posted : Wednesday, 13 September 2006 4:46:35 AM(UTC)
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I'll give it a try. Thanks
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xcrpakute Offline
#7 Posted : Wednesday, 13 September 2006 2:31:52 PM(UTC)
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How many km's are on the motor?
If its getting up there being a clevo I would eyeball
the timming chain then go for a colder plug.
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sly376 Offline
#8 Posted : Thursday, 14 September 2006 4:31:06 AM(UTC)
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Lucky if it has 20000 since re-build which was about 4 years ago & I did put a new roller master double row timing chain set in it. I have BP5FS NGK plugs at the moment & I'm getting BP6FS plugs on Friday that's the coldest plug I could get hold of.
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xcrpakute Offline
#9 Posted : Saturday, 16 September 2006 6:35:35 AM(UTC)
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sly376 Just for the record what compresion do you have?


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sly376 Offline
#10 Posted : Saturday, 16 September 2006 8:39:00 AM(UTC)
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It's about 10:1 compression ratio but I have never had a problem untill now! I just tried colder plugs, a tank of that new optmax extreme (100 octane) & an octane boost so that's atleast 107 octane! She still pings 3000rpm up & you have to drive it like a
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#11 Posted : Saturday, 16 September 2006 10:40:53 AM(UTC)
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Hi Sly,

Firstly, put a timing light on her and have a look at what the timing is doing at 3 grand. You should have about 36 degrees of total ignition advance and, certainly, no more than 40.

Another problem can be a build-up of carbon in the combust
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sly376 Offline
#12 Posted : Sunday, 17 September 2006 4:31:05 AM(UTC)
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Had a look at the timing today base & advance, seems to be spot on if anything slightly retarded, 12 deg base & max advance at about 4000 rpm is 34 with the slowest curve. Tried the water in a pressure pack pumped close to a litre in it over about an hour
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#13 Posted : Sunday, 17 September 2006 9:20:26 AM(UTC)
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Are you sure that guage is reading correctly? About 15 - 20 psi at idle and 30 - 40 at higher revs are more normal oil pressure readings.

Cheers...Dave
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sly376 Offline
#14 Posted : Sunday, 17 September 2006 11:38:43 PM(UTC)
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hmmm I'm pretty sure it's reading correctly. Do you know the factory specs that these things run?
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sly376 Offline
#15 Posted : Monday, 18 September 2006 12:01:24 AM(UTC)
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Just found a factory spec it just says 40 PSI Min at 2000 rpm
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#16 Posted : Monday, 18 September 2006 10:37:32 AM(UTC)
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I'd think you'd be blowing seals left, right and centre at 70 PSI...

Just a thought...how's your timing chain?

Cheers...Dave
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XB351 Offline
#17 Posted : Tuesday, 19 September 2006 3:08:45 AM(UTC)
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What it looks like to me is your trying to dial too much timing into it. Is the cam solid or hydraulic. If it's a hyd camshaft you need no more than 30-32 deg max. I used to run 12 inital 36 total on my solid cammed 351 with 10.5:1 compression. That's all
XB Fairmont sedan : [email protected]
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sly376 Offline
#18 Posted : Tuesday, 19 September 2006 7:06:33 AM(UTC)
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Hey boys thanks for all your posts I have found my problem, what sounded like a bad ping has turned out to be much worse! I pulled my rocker gear apart & cam etc, I found one roller rocker worn like the pushrod was moving away from the seat & wore the rol
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#19 Posted : Tuesday, 19 September 2006 10:10:53 AM(UTC)
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Bugger...not what you wanted to find, but at least you found the problem and can now fix it.

Did you run the cam in properly on the last rebuild?

Cheers...Dave
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XB351 Offline
#20 Posted : Wednesday, 20 September 2006 12:56:22 AM(UTC)
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ouch. Rocker gear banging wouldn't have sounded like pinging. It would have been banging quite loudly. I've broken rocker gear in my prior engine due to poor machine work. It sounded real nasty. Redid the machine work and never touched the rocker gear for
XB Fairmont sedan : [email protected]
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