Here is a picture of one of my failed gaskets.Coating is badly damaged, but not sure if this was subsequent over heating or a root cause of failure. Witness marks seem to show failure in the coolant galeries close to the liners.
Failure mode of the cooling system was sudden loss of coolant, apparently from presurization of cooling system from combustion chamber. Did several combustion gas checks that were negative, final test done by my very experienced independent shop was positive. Only seemed to occur under load at reasonable rpm (say 4000 or more with some boost). No obvious cross over of oil and coolant noted, but on disassembly some mayonaise seen in the cooling system tubes from the turbo's, which confirmed crossover did occur.
Very frustrating problem, as we have essentially refurbished the cooling system completely and have not solved the issues. This recent head gasket failure is the second while I have owned the car. First failure was a small external leak located at front right, just above the alternator. May have caused two alternator failures due to dripping coolant; no coolant seen below car as it would presumably only leak intermitently and slow enugh to evaporate off.
I did not see the head gaskets removed on the first job, but the tech swears they were not OEM, and not even of the laminated steel type. This seems real strange to me, and might not be accurate. As I say, never saw the gaskets, just saw the evidence of the external leak and noted very rapid coolant loss/consumption (about 1/2 litre per day if steady running). Anyone seen V8 head gaskets that are other than the laminated steel type?
Replacement gaskets are installed, and just waiting for turbo's to come back from service/rebuild before recommisioning the car (2000 V8). Very strange, as I have an impeller failure on one of the turbo's, even after rebuild last winter with the first head gasket job. Whether this failure is related to the head hasket failure, sudden coolant loss on track, brief overheating, oil/water crossover, etc. I am not sure.
Don't think we have an overboost issue happening. Seems to be normal boost pressures according to my gauge I installed last winter after the head gasket replacement.
We have used OEM head gaskets this time based on recommendations from other folks and on-line research. Sourced the OEM gaskets from Steve at SJ. He indicated to me he was not aware of failures with the aftermarket gaskets. He did mention he supplies and sells the same aftermarket gaskets as JAE; I assume these are the 'Steve's Pick' gaskets on his site for about half the cost of OEM, but perhaps others who have bought them can confirm. Although he could supply me with OEM gaskets (about two months ago), he mentioned they may be the last set he has available right now. I did not interpret this to mean OEM gaskets are not available any more, just not in stock with him right now and perhaps not in stock with Lotus or through his supply chain. Trying to be very clear here, as I did not understand @Bibs mention of someone being banned for saying (among other thinks apparently, I can't really follow the posts and back and forth too well) Lotus does not have any more V8 gaskets available in this other thread. Not taking issue with anything, just saying I do not know what the exact gasket supply situation is, but understand the OEM ones are hard to get...
https://www.thelotusforums.com/forums/topic/84521-fourth-time-blown-head-gasket/
I do not know right now what caused my second gasket failure. Hoping the OEM gaskets solve the problem, but no experience to report yet. Unfortunately it is going to be a very short fall driving season here in Alberta after the new gaskets are installed. I do have a Track Day scheduled for October 1st that hopefully will use the Esprit. The track is about three hours (one way) from home, so it should be an excellent road test if trhe car is ready in time and the snow is not too deep . It is actually snowing in Banff today, so fingers are crossed.
I have not contacted JAE yet about my most recent failure, as (1) I did not purchase the gaskets, the shop did, (2) I do not know specifically what caused the failure, and (3) I don't know yet if the coolant loss issue will be solved with the new OEM gaskets. If the OEM gaskets solve the problem I am prepared to report results to Jay and Steve. As Steve mentioned to me in an email, the only way the suppliers know if there is an issue is if we let them know. I am pretty confident in the shop doing the work, but things can happen on assembly, etc. We did send the heads out for cleanup, the block deck was checked, etc. The shop has done extensive work on a number of Esprit V8's, including heads, liners, etc.
Can someone confirm the head torque spec we should be using? I believe we are using stock head bolts, but I will check on that important detail.
'Guest' asked about the gasket replacement job being done with the engine in or out of the car. My gaskets were done with the engine in the car. My understanding is if you are using ARP replacement studs the engine has to be pulled to provide enough clearance to get the head off over the studs, but I am absolutely open to correction on this detail.
There is a post above in this thread that 'Guest' says is from the archive; not quite sure what is meant there. I think it is actually taken from this thread on Lotus Talk, but not sure. Although it says 'Stu' at the top of the post, it is not based on my experience. Rather it was another fellow on Lotus Talk that reported solving his coolant loss issue with OEM gaskets, and he posted publically after I enquired if he had solved his specific issue. This was when we were planning my head gasket replacement job. The thread contains a bit of history on my first gasket failure...
http://www.lotustalk.com/forums/f164/bad-news-v8-head-gasket-330489/
I did hear off list from one other person regarding this issue, and he also reported OEM gaskets solved his problem of sudden coolant loss. We will see if he also posts in this thread.
Looking at the HowardRoark thread regarding sudden coolant loss, I am wondering if it is another occurance of the same issue? I thouight I simply had an air bubble in the cooloing system, but definitely gasket failure.
Hope this helps. Any experiences, good or bad, are probably helpful.
Stay Calm and Carry On I guess. Wish me luck.
Stu