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Author Topic: Sticky oil pressure relief valve  (Read 284 times)
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BlueKSO
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« on: 01 March, 2019, 09:56:01 PM »

re;  63 Series 1 Flavia Coupe

Has anyone had any experience freeing off a sticky oil pressure relief valve.  Situated, as far I can make out from various diagrams, in the top of the oil filter canister, the part you take off when changing the filter.

All advice gratefully appreciated .

Cheers,  Peter
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Richard Fridd
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« Reply #1 on: 02 March, 2019, 07:33:18 AM »

Is it stuck open or shut? Is there a timing chain oil spout similar to a Fulvia, which can break off, causing low oil pressure?
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Richard Nevison Fridd
BlueKSO
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« Reply #2 on: 02 March, 2019, 05:45:40 PM »

No, the needle on the gauge, 90% of the time acts normally.  But every now and then goes way past max which it maintains for a short while and then suddenly jumps back to normal max.  Every indication that the relief valve is sticking open.  Iím just worried about my poor old oil cooler pipes and radiator!

Cheers, Peter
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lancialulu
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« Reply #3 on: 02 March, 2019, 06:50:58 PM »

No, the needle on the gauge, 90% of the time acts normally.  But every now and then goes way past max which it maintains for a short while and then suddenly jumps back to normal max.  Every indication that the relief valve is sticking open.  Iím just worried about my poor old oil cooler pipes and radiator!

Cheers, Peter
if. It does this when engine is hot then I doubt it is the relief valve as the oil pressure is then determined by cumulative tolerances in Lancia engines. If in doubt put another mechanical pressure gauge in series with the oil pressure pipe.
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Its not the winning but taking part! or is it taking apart?
1955 Aurelia B12
1967 Flavia Vignale iniezione
1967 Fulvia HFR
1972 1600 HF
1972 1600 Fulvia Sport
1978 Transformer HF3000 Strato's replica
1979 2500 Gamma Coupe
1988 Delta 1.6GTi.e.
Richard Fridd
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« Reply #4 on: 03 March, 2019, 08:50:03 AM »

Perhaps the sender is faulty?
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Richard Nevison Fridd
BlueKSO
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« Reply #5 on: 03 March, 2019, 09:31:10 AM »

Tim,  it can do it from cold.  Purely from past experience, not with Lancia mind you, Iíve found this kind of indicative behaviour points to the relief valve.  So if as I believe the valve is in the filter head, I just want to make sure Iím not going to upset any adjustments in my attempt to rectify it.

Richard,  as far as Iím aware the system is purely mechanical, no electrical sender unit is involved.

Cheers,  Peter
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