Beast lives after oil pump failure!
05-24-2003, 12:10 AM
#1
Instructor
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Beast lives after oil pump failure!
Last week the oil pump seized and with a quick zipping sound munched the timing belt. I know most would think : bent valves, etc. I put in a new pump and timing belt, did a compression check, and it started back up like nothing ever happened. My car must have nine lives. It is amazing how lucky it has been, it has had a belt break before. I guess this could start the interference engine debate again. My car apparently is not an interference engine. If only SITM were this weekend....
05-24-2003, 12:27 AM
#2
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Hi,
Sad to here of your plight. A great save however.
As a matter of interest what brand, type and grade of engine oil do you use
Buy a lottery ticket with your luck !
Regards
Sad to here of your plight. A great save however.
As a matter of interest what brand, type and grade of engine oil do you use
Buy a lottery ticket with your luck !
Regards
05-24-2003, 01:48 PM
#4
Bruce,
Great news. We need to save all the OB's we can. Concerning the interference/noninterference issue, all 16 valve engine should be noninterference IF the heads are original and have not been machine more than .4mm as stated on page 15-19 of the factory service manual.
Dennis
Great news. We need to save all the OB's we can. Concerning the interference/noninterference issue, all 16 valve engine should be noninterference IF the heads are original and have not been machine more than .4mm as stated on page 15-19 of the factory service manual.
Dennis
05-24-2003, 03:40 PM
#5
Photoshop Bully
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Along time ago, a friend of mine worked at a euro car dealer. He witnessed something sad, but it says alot for Porsche engineering. The owners friend had just crashed his 928 hard in the nose. He wanted to make sure it was totaled, so he smashed the oil pan and started the car. My friend told me the car idled for 45 minutes before it seized! My friend and I had nothing at all to do with this, so save me the soapbox speeches. I still cringe when I think about it.
05-25-2003, 01:45 AM
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Interesting. I am sure I have seen several parties print it here that all engines except for the earliest low compression models (till 78?) *are* intersection.
05-25-2003, 01:31 PM
#7
Old & New,
As in this case, there have been many later 16 valve engines that have had timing belt disasters without valve damage. There has to be another variable (overmachining, thrown valve?) thrown in for the ones that did have damage. Porsche recognized this when they built the engine and included measuring blocks on the outside of the head to make sure they weren't overmachined. How many machine shops know the specs or what the indicators are there for? Additionally, the timing belt changing instructions for all 16 valvers does not require prepositioning the cams (due to the non-interference) like the 32 valvers.
"(till 78?) *are* intersection."
This statement has me stumped. The 78 MY was the first real production year. Are you saying that ALL 16 valvers are interference?
Dennis
As in this case, there have been many later 16 valve engines that have had timing belt disasters without valve damage. There has to be another variable (overmachining, thrown valve?) thrown in for the ones that did have damage. Porsche recognized this when they built the engine and included measuring blocks on the outside of the head to make sure they weren't overmachined. How many machine shops know the specs or what the indicators are there for? Additionally, the timing belt changing instructions for all 16 valvers does not require prepositioning the cams (due to the non-interference) like the 32 valvers.
"(till 78?) *are* intersection."
This statement has me stumped. The 78 MY was the first real production year. Are you saying that ALL 16 valvers are interference?
Dennis
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05-25-2003, 05:38 PM
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Dennis,
Interesting. I just went back and read a bunch of old posts on the topic. It seems that there is a lot of misinformation out there... which I apparently had subscibed to.
The appearance of interference appears to be concurrent with either the 10.4:1 compression 86, or the 4-valve. Anecdotally, the RPM may play a part in the equation, also.
<flamesuit> It also appears that there has been a lot of unwarranted hand-wringing regarding the service interval in these earlier non-interference engines! </flamesuit>
Interesting. I just went back and read a bunch of old posts on the topic. It seems that there is a lot of misinformation out there... which I apparently had subscibed to.
The appearance of interference appears to be concurrent with either the 10.4:1 compression 86, or the 4-valve. Anecdotally, the RPM may play a part in the equation, also.
<flamesuit> It also appears that there has been a lot of unwarranted hand-wringing regarding the service interval in these earlier non-interference engines! </flamesuit>
05-26-2003, 12:29 AM
#9
Old & New,
No flame suit required considering there are a lot of OB's out there that have had head work. I for one, don't know how much has been taken off the 78 euro's heads.
Dennis
No flame suit required considering there are a lot of OB's out there that have had head work. I for one, don't know how much has been taken off the 78 euro's heads.
Dennis